cleanup: remove distribution specific task files and strip dns renewal hook

Remove the specific task files for each distribution and replace them with a dict in the defaults. Furthermore, remove the fixed deploy hook from the DNS challenge mode and provide ways to extend the lego cmd.

defaults/main.yml

 ---
-# certbot settings
-certbot_dns_challenge: false                                                          # default use webserver, true to obtain certificate using dns challenge
-certbot_lego_version: "4.11.0"                                                        # lego version - Let's Encrypt client
-certbot_dns_provider: "designate"                                                     # list of available providers https://go-acme.github.io/lego/dns/
-dns_provider_auth_env_variables:                                                      # variables required to authenticate dns provider
-  OS_AUTH_URL: "https://openstack.example.org"
-  OS_REGION_NAME: "RegionOne"
-  OS_AUTH_TYP: "v3applicationcredential"                                              # default is to use application credential rather than password
-  OS_APPLICATION_CREDENTIAL_ID: "{{ vault_os_application_credential_id }}"
-  OS_APPLICATION_CREDENTIAL_SECRET: "{{ vault_os_application_credential_secret }}"
+# Packages / timer names based on Distribution
+certbot_pkg_name:
+  CentOS: "certbot"
+  Debian: "certbot"
+  Ubuntu: "certbot"
+  Fedora: "certbot"
 
+# TODO: Might need to change
+certbot_timer_name:
+  CentOS: "certbot-renew.timer"
+  Debian: "certbot.timer"
+  Ubuntu: "snap.certbot-renew.timer"
+  Fedora: "certbot-renew.timer"
 
-certbot_fqdn:
-  - example.de
-certbot_admin_email: "admin@example.de"
-# certbot_webroot: "/var/www/example"                                                 # if undefined use --standalone
+# certbot settings
+dns_challenge: false                                                                  # default use webserver, true to obtain certificate using dns challenge
+lego_version: "4.11.0"                                                                # lego version - Let's Encrypt client
+lego_dns_provider: "designate"                                                        # list of available providers https://go-acme.github.io/lego/dns/
+dns_provider_auth_env_variables: {}                                                    # variables required to authenticate dns provider
 
-# application settings
-# certbot_application: "example"                                                      # if defined copy certs to application dir and setup deploy hooks
-certbot_application_dir: "/etc/{{ certbot_application }}"
-certbot_application_deploy_hook: |
-  #!/bin/sh
+cert_fqdns:
+  - example.de
+admin_email: "admin@example.de"
 
-  cp {{ certbot_live_dir }}/fullchain.pem {{ certbot_application_dir }}
-  cp {{ certbot_live_dir }}/privkey.pem {{ certbot_application_dir }}
 
-  systemctl restart {{ certbot_application }}.service
+# LEGO Settings
+lego_extra_flags: []