Add frontend team codeowners rules
* @readthedocs/backend
-
+*.js @readthedocs/frontend
+*.html @readthedocs/frontend
+*.css @readthedocs/frontend
+*.less @readthedocs/frontend
+*.scss @readthedocs/frontend
+*.svg @readthedocs/frontend
+*.png @readthedocs/frontend
+*.jpg @readthedocs/frontend
/docs/ @readthedocs/advocacy
