refactor: simplify how url generation works

The URLS file is no longer necessary as urls are now generated directly from the app VHOST file.

This also moves all the url generation logic to the domains plugin.

plugins/00_dokku-standard/subcommands/urls

@@ -1,15 +1,15 @@
 #!/usr/bin/env bash
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 cmd-urls() {
   declare desc="reports dokku vitals for troubleshooting"
   declare cmd="url"
-  declare APP="$2"
+  declare URL_TYPE="$1" APP="$2"
 
   verify_app_name "$APP"
-  get_app_urls "$@"
+  plugn trigger domains-urls "$APP" "$URL_TYPE"
 }
 
 cmd-urls "$@"