Refactor frontpage for grammar and style

docs/index.md

 ---
-toc: false
 comments: false
-last_updated: 2018-11-07
+last_updated: 2019-01-17
 ---
 
 # GitLab Runner
 
-[![Build Status](https://gitlab.com/gitlab-org/gitlab-runner/badges/master/build.svg)](https://gitlab.com/gitlab-org/gitlab-runner)
-
 GitLab Runner is the open source project that is used to run your jobs and
-send the results back to GitLab. It is used in conjunction with [GitLab CI][ci],
+send the results back to GitLab. It is used in conjunction with [GitLab CI](https://about.gitlab.com/product/continuous-integration/),
 the open-source continuous integration service included with GitLab that
 coordinates the jobs.
 
+[![Build Status](https://gitlab.com/gitlab-org/gitlab-runner/badges/master/build.svg)](https://gitlab.com/gitlab-org/gitlab-runner)
+
 ## Requirements
 
-GitLab Runner is written in [Go][golang] and can be run as a single binary, no
+GitLab Runner is written in [Go](https://golang.org) and can be run as a single binary, no
 language specific requirements are needed.
 
 It is designed to run on the GNU/Linux, macOS, and Windows operating systems.
@@ -28,24 +27,24 @@ installed.
 ## Features
 
 - Allows to run:
-  - multiple jobs concurrently
-  - use multiple tokens with multiple server (even per-project)
-  - limit number of concurrent jobs per-token
+  - Multiple jobs concurrently.
+  - Use multiple tokens with multiple server (even per-project).
+  - Limit number of concurrent jobs per-token.
 - Jobs can be run:
-  - locally
-  - using Docker containers
-  - using Docker containers and executing job over SSH
-  - using Docker containers with autoscaling on different clouds and virtualization hypervisors
-  - connecting to remote SSH server
-- Is written in Go and distributed as single binary without any other requirements
-- Supports Bash, Windows Batch and Windows PowerShell
-- Works on GNU/Linux, macOS and Windows (pretty much anywhere you can run Docker)
-- Allows to customize the job running environment
-- Automatic configuration reload without restart
-- Easy to use setup with support for Docker, Docker-SSH, Parallels or SSH running environments
-- Enables caching of Docker containers
-- Easy installation as a service for GNU/Linux, macOS and Windows
-- Embedded Prometheus metrics HTTP server
+  - Locally.
+  - Using Docker containers.
+  - Using Docker containers and executing job over SSH.
+  - Using Docker containers with autoscaling on different clouds and virtualization hypervisors.
+  - Connecting to remote SSH server.
+- Is written in Go and distributed as single binary without any other requirements.
+- Supports Bash, Windows Batch, and Windows PowerShell.
+- Works on GNU/Linux, macOS, and Windows (pretty much anywhere you can run Docker).
+- Allows customization of the job running environment.
+- Automatic configuration reload without restart.
+- Easy to use setup with support for Docker, Docker-SSH, Parallels, or SSH running environments.
+- Enables caching of Docker containers.
+- Easy installation as a service for GNU/Linux, macOS, and Windows.
+- Embedded Prometheus metrics HTTP server.
 
 ## Compatibility chart
 
@@ -55,24 +54,24 @@ features may be not available or work properly if there's a version difference.
 
 Backward incompatibility is allowed only for major version updates.
 
-## [Install GitLab Runner](install/index.md)
+## Install GitLab Runner
 
-GitLab Runner can be installed and used on GNU/Linux, macOS, FreeBSD and Windows.
+GitLab Runner can be [installed](install/index.md) and used on GNU/Linux, macOS, FreeBSD, and Windows.
 You can install it using Docker, download the binary manually or use the
 repository for rpm/deb packages that GitLab offers. Below you can find
 information on the different installation methods:
 
-- [Install using GitLab's repository for Debian/Ubuntu/CentOS/RedHat (preferred)](install/linux-repository.md)
-- [Install on GNU/Linux manually (advanced)](install/linux-manually.md)
-- [Install on macOS](install/osx.md)
-- [Install on Windows](install/windows.md)
-- [Install as a Docker service](install/docker.md)
-- [Install in autoscaling mode using Docker machine](executors/docker_machine.md)
-- [Install on FreeBSD](install/freebsd.md)
-- [Install on Kubernetes](install/kubernetes.md)
-- [Install the nightly binary manually (development)](install/bleeding-edge.md)
+- [Install using GitLab's repository for Debian/Ubuntu/CentOS/RedHat (preferred)](install/linux-repository.md).
+- [Install on GNU/Linux manually (advanced)](install/linux-manually.md).
+- [Install on macOS](install/osx.md).
+- [Install on Windows](install/windows.md).
+- [Install as a Docker service](install/docker.md).
+- [Install in autoscaling mode using Docker machine](executors/docker_machine.md).
+- [Install on FreeBSD](install/freebsd.md).
+- [Install on Kubernetes](install/kubernetes.md).
+- [Install the nightly binary manually (development)](install/bleeding-edge.md).
 
-## [Register GitLab Runner](register/index.md)
+## Register GitLab Runner
 
 Once GitLab Runner is installed, you need to register it with GitLab.
 
@@ -80,40 +79,42 @@ Learn how to [register a GitLab Runner](register/index.md).
 
 ## Using GitLab Runner
 
-- [See the commands documentation](commands/README.md)
+- See the [commands documentation](commands/README.md).
 
-## [Selecting the executor](executors/README.md)
+## Selecting the executor
 
-GitLab Runner implements a number of executors that can be used to run your
+GitLab Runner implements a number of [executors](executors/README.md) that can be used to run your
 builds in different scenarios. If you are not sure what to select, read the
 [I am not sure](executors/README.md#i-am-not-sure) section.
 Visit the [compatibility chart](executors/README.md#compatibility-chart) to find
 out what features each executor supports and what not.
 
-To jump into the specific documentation of each executor, visit:
+To jump into the specific documentation of each executor, see:
+
+- [Shell](executors/shell.md).
+- [Docker](executors/docker.md).
+- [Docker Machine and Docker Machine SSH (autoscaling)](executors/docker_machine.md).
+- [Parallels](executors/parallels.md).
+- [VirtualBox](executors/virtualbox.md).
+- [SSH](executors/ssh.md).
+- [Kubernetes](executors/kubernetes.md).
 
-- [Shell](executors/shell.md)
-- [Docker](executors/docker.md)
-- [Docker Machine and Docker Machine SSH (autoscaling)](executors/docker_machine.md)
-- [Parallels](executors/parallels.md)
-- [VirtualBox](executors/virtualbox.md)
-- [SSH](executors/ssh.md)
-- [Kubernetes](executors/kubernetes.md)
+## Configuring GitLab Runner
 
-## [Advanced Configuration](configuration/index.md)
+See information on [configuring GitLab Runner](configuration/index.md), and:
 
-- [Advanced configuration options](configuration/advanced-configuration.md) Learn how to use the [TOML][] configuration file that GitLab Runner uses.
-- [Use self-signed certificates](configuration/tls-self-signed.md) Configure certificates that are used to verify TLS peer when connecting to the GitLab server.
-- [Autoscaling using Docker machine](configuration/autoscale.md) Execute jobs on machines that are created on demand using Docker machine.
+- [Advanced configuration options](configuration/advanced-configuration.md): Learn how to use the [TOML](https://github.com/toml-lang/toml) configuration file that GitLab Runner uses.
+- [Use self-signed certificates](configuration/tls-self-signed.md): Configure certificates that are used to verify TLS peer when connecting to the GitLab server.
+- [Autoscaling using Docker machine](configuration/autoscale.md): Execute jobs on machines that are created on demand using Docker machine.
 - [Autoscaling GitLab Runner on AWS](configuration/runner_autoscale_aws/index.md)
-- [The init system of GitLab Runner](configuration/init.md) Learn how the Runner installs its init service files based on your operating system.
-- [Supported shells](shells/README.md) Learn what shell script generators are supported that allow to execute builds on different systems.
-- [Security considerations](security/index.md) Be aware of potential security implications when running your jobs with GitLab Runner.
-- [Runner monitoring](monitoring/README.md) Learn how to monitor the Runner's behavior.
-- [Cleanup the Docker images automatically](https://gitlab.com/gitlab-org/gitlab-runner-docker-cleanup) A simple Docker application that automatically garbage collects the GitLab Runner caches and images when running low on disk space.
-- [Configure GitLab Runner to run behind a proxy](configuration/proxy.md) Learn how to set up a Linux proxy and configure GitLab Runner. Especially useful for the Docker executor.
-- [Feature Flags](configuration/feature-flags.md) Learn how to use feature flags to get access to features in beta stage or to enable breaking changes before the full deprecation and replacement is handled.
-- [Configure Session Server](configuration/advanced-configuration.md#the-session_server-section) Learn how to configure a session server for interacting with jobs the Runner is responsible for.
+- [The init system of GitLab Runner](configuration/init.md): Learn how the Runner installs its init service files based on your operating system.
+- [Supported shells](shells/README.md): Learn what shell script generators are supported that allow to execute builds on different systems.
+- [Security considerations](security/index.md): Be aware of potential security implications when running your jobs with GitLab Runner.
+- [Runner monitoring](monitoring/README.md): Learn how to monitor the Runner's behavior.
+- [Cleanup the Docker images automatically](https://gitlab.com/gitlab-org/gitlab-runner-docker-cleanup): A simple Docker application that automatically garbage collects the GitLab Runner caches and images when running low on disk space.
+- [Configure GitLab Runner to run behind a proxy](configuration/proxy.md): Learn how to set up a Linux proxy and configure GitLab Runner. Especially useful for the Docker executor.
+- [Feature Flags](configuration/feature-flags.md): Learn how to use feature flags to get access to features in beta stage or to enable breaking changes before the full deprecation and replacement is handled.
+- [Configure Session Server](configuration/advanced-configuration.md#the-session_server-section): Learn how to configure a session server for interacting with jobs the Runner is responsible for.
 
 ## Troubleshooting
 
@@ -126,7 +127,7 @@ the [release documentation](release_process/README.md).
 
 ## Contributing
 
-Contributions are welcome, see [`CONTRIBUTING.md`][contribute] for more details.
+Contributions are welcome, see [`CONTRIBUTING.md`](https://gitlab.com/gitlab-org/gitlab-runner/blob/master/CONTRIBUTING.md) for more details.
 
 ## Development
 
@@ -135,15 +136,8 @@ Runner.
 
 ## Changelog
 
-Visit [Changelog] to view recent changes.
+See the [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-runner/blob/master/CHANGELOG.md) to view recent changes.
 
 ## License
 
-This code is distributed under the MIT license, see the [LICENSE][] file.
-
-[ci]: https://about.gitlab.com/gitlab-ci
-[Changelog]: https://gitlab.com/gitlab-org/gitlab-runner/blob/master/CHANGELOG.md
-[contribute]: https://gitlab.com/gitlab-org/gitlab-runner/blob/master/CONTRIBUTING.md
-[golang]: https://golang.org/
-[LICENSE]: https://gitlab.com/gitlab-org/gitlab-runner/blob/master/LICENSE
-[TOML]: https://github.com/toml-lang/toml
+This code is distributed under the MIT license, see the [LICENSE](https://gitlab.com/gitlab-org/gitlab-runner/blob/master/LICENSE) file.