Harden github path

The whole idea of "hardening" the .github path is to prevent
large teams to have access to that path.

Instead, only a subset of that team must be allowed that.

In our case, we're a team of 3 at Neo4j, so listing us 3 should
be fine, even if the team grows beyond that.

.github/CODEOWNERS

@@ -1 +1,3 @@
 *       @neo4j-field/team-connectors
+
+/.github/   @ali-ince @fbiville @venikkin