Remove the gitlab CODEOWNERS file. Change the issue/PR templates to point to github (swift-server#67)

* Change the issue and merge templates for Gitlab, pointing to Github instead

* Remove codeowners file

* Deduplicate the issue templates

Author: Joannis

.gitlab/CODEOWNERS

@@ -0,0 +1,4 @@
+## Repository Moved
+
+Gitlab is a mirror of the [github repo](https://github.com/swift-server/RediStack).
+Please file your issues there.

.gitlab/issue_templates/Bug.md

@@ -1,23 +1,5 @@
-_[One sentence description of the bug being fixed]_
+## Repository Moved
 
-**If the bug being fixed has an issue written**
+Gitlab is a mirror of the [github repo](https://github.com/swift-server/RediStack).
+Please make a PR for your changes there.
 
-Fixes _[GitLab Issue link]_.
-
-**If the bug being fixed does NOT have an issue written**
-
-## Expected Results
-_[what you expected to happen]_
-
-## Actual Results
-_[what actually happened]_
-
-## Steps to Reproduce
-
-1. ...
-2. ...
-
-## Checklist:
-
-- [ ] Copyright headers in new files (see [CONTRIBUTING.md](https://gitlab.com/Mordil/RediStack/-/blob/master/CONTRIBUTING.md))
-- [ ] Unit test case to prevent the bug in the future