FIX Make sure clear and ide are accessible (#67)

Author: GuySartorelli

_config/config.yml

@@ -13,7 +13,7 @@ Name: devtool-routes
 After:
   - 'graphql-dev'
 ---
-SilverStripe\GraphQL\Dev\DevelopmentAdmin:
+SilverStripe\Dev\DevelopmentAdmin:
   commands:
     'graphql/clear': 'SilverStripe\GraphQLDevTools\SchemaClear'
   controllers:

src/Controller.php

@@ -27,6 +27,10 @@ class Controller extends BaseController
      */
     private static $schemas = [];
 
+    private static array $url_handlers = [
+        'ide' => 'index',
+    ];
+
     /**
      * @var string
      */