hardware: tweak core and core-webui targets

given that relay, button and led settings may be hardcoded,
explicitly remove from -core and -core-webui
restore telnet debugging though, since the terminal output needs it

for -core-webui, disables mdns and the generic webui server + webui blob
per 56f74cfe, make the resulting .bin even smaller

code/espurna/button.cpp

@@ -880,14 +880,14 @@ void buttonEvent(size_t id, ButtonEvent event) {
 
     switch (action) {
 
-#if RELAY_SUPPORT
     case ButtonAction::Toggle:
     case ButtonAction::On:
     case ButtonAction::Off:
     case ButtonAction::Pulse:
+#if RELAY_SUPPORT
         _buttonRelayAction(id, action);
-        break;
 #endif
+        break;
 
     case ButtonAction::AccessPoint:
         wifiToggleAp();