Remove Element .github stuff

Author: su-ex

.github/CODEOWNERS

@@ -1,11 +1,5 @@
-<!-- Please read https://github.com/matrix-org/matrix-js-sdk/blob/develop/CONTRIBUTING.md before submitting your pull request -->
+<!-- Please describe your awesome changes here -->
 
-<!-- Include a Sign-Off as described in https://github.com/matrix-org/matrix-js-sdk/blob/develop/CONTRIBUTING.md#sign-off -->
+-----------------------------------------------------------------------------
 
-<!-- To specify text for the changelog entry (otherwise the PR title will be used):
-Notes:
-
-Changelog entries will also appear in element-desktop. For PRs that *only* affect the desktop version:
-Notes: none
-element-desktop notes: <notes>
--->
+- [ ] I agree to release my changes under this project's license