Add reference-servers-maintainers GitHub team with admin on servers repo (#88)

- Expand REFERENCE_SERVERS_MAINTAINERS role (previously Discord-only) to
  create a GitHub team
- Grant the team admin permission on modelcontextprotocol/servers
- Add tobinsouth as a new member

Existing members cliffhall and olaservo will also be added to the new
GitHub team.

🏠 Remote-Dev: homespace

src/config/users.ts

@@ -674,6 +674,11 @@ export const MEMBERS: readonly Member[] = [
     github: 'tiginamaria',
     memberOf: [ROLE_IDS.KOTLIN_SDK],
   },
+  {
+    github: 'tobinsouth',
+    discord: '865072069779521556',
+    memberOf: [ROLE_IDS.REFERENCE_SERVERS_MAINTAINERS],
+  },
   {
     github: 'toby',
     email: 'toby@modelcontextprotocol.io',