refactor: move all shellcheck disable definitions to .shellcheckrc file

This makes standard use of shellcheck work without needing to provide extra configuration anywhere.

Also remove use of inline 'shellcheck disable' calls that are already defined in the .shellcheckrc and don't need to be set inline.

plugins/domains/functions

@@ -16,7 +16,6 @@ disable_app_vhost() {
   fi
 
   [[ "$RESTART_APP" == "--no-restart" ]] && local CONFIG_SET_ARGS=$RESTART_APP
-  # shellcheck disable=SC2086
   DOKKU_QUIET_OUTPUT=1 config_set $CONFIG_SET_ARGS $APP NO_VHOST=1
 }
 
@@ -196,7 +195,6 @@ enable_app_vhost() {
 
   plugn trigger pre-enable-vhost "$APP"
   [[ "$RESTART_APP" == "--no-restart" ]] && local CONFIG_SET_ARGS=$RESTART_APP
-  # shellcheck disable=SC2086
   DOKKU_QUIET_OUTPUT=1 config_set $CONFIG_SET_ARGS "$APP" NO_VHOST=0
 }