Deprecate router client

meshtastic/config.proto

@@ -37,7 +37,9 @@ message Config {
 
       /*
        * Description: Combination of both ROUTER and CLIENT. Not for mobile devices.
+       * Deprecated in v2.3.15 because improper usage is impacting public meshes: Use ROUTER or CLIENT instead.
        */
+      [deprecated = true]
       ROUTER_CLIENT = 3;
 
       /*