docs: Use COC and contrib from fluxcd/.github repo

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

Author: stefanprodan

.github/CODEOWNERS

@@ -1,14 +1,3 @@
 # These owners will be the default owners for everything in
 # the repo. Unless a later match takes precedence.
 *                   @fluxcd/core-maintainers
-
-# The following have a bit more specific owners and require e.g.
-# specific domain expertise.
-/actions/           @stefanprodan
-/apis/              @hiddeco @stefanprodan
-/ssa/               @stefanprodan
-/runtime/           @hiddeco @stefanprodan
-/sourceignore/      @hiddeco
-/kustomize/         @stefanprodan
-/git/               @aryan9600 @hiddeco
-/oci/               @stefanprodan