Removed WORKSPACE file

Since we removed bazel, this is not needed any more.

WORKSPACE

-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-
-# Bazel Go rules
-http_archive(
-    name = "io_bazel_rules_go",
-    urls = ["https://github.com/bazelbuild/rules_go/releases/download/0.12.1/rules_go-0.12.1.tar.gz"],
-    sha256 = "8b68d0630d63d95dacc0016c3bb4b76154fe34fca93efd65d1c366de3fcb4294",
-)
-
-# Bazel Gazelle integration
-http_archive(
-    name = "bazel_gazelle",
-    urls = ["https://github.com/bazelbuild/bazel-gazelle/releases/download/0.12.0/bazel-gazelle-0.12.0.tar.gz"],
-    sha256 = "ddedc7aaeb61f2654d7d7d4fd7940052ea992ccdb031b8f9797ed143ac7e8d43",
-)
-
-load("@io_bazel_rules_go//go:def.bzl", "go_rules_dependencies", "go_register_toolchains")
-go_rules_dependencies()
-go_register_toolchains()
-
-load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")
-gazelle_dependencies()