chore(CODEOWNERS): add Engineering for workflows and CODEOWNERS (mdn#206)

* chore(CODEOWNERS): add Engineering for workflows and CODEOWNERS

* chore(CODEOWNERS): replace mdn/{core-yari-content => content-team}

Co-authored-by: Brian Smith <brian@smith.berlin>

---------

Co-authored-by: Brian Smith <brian@smith.berlin>

Author: caugner

.github/CODEOWNERS

@@ -6,4 +6,7 @@
 # https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/about-code-owners
 
 # Default
-* @mdn/core-yari-content
+* @mdn/content-team
+
+/.github/workflows/ @mdn/engineering
+/.github/CODEOWNERS @mdn/content-team @mdn/engineering