remove unnecessary module

apps/app/src/server/service/playground-2.mongodb.js

@@ -1,36 +0,0 @@
-/* global use, db */
-// MongoDB Playground
-// Use Ctrl+Space inside a snippet or a string literal to trigger completions.
-
-// The current database to use.
-use('growi');
-
-// Search for documents in the current collection.
-db.getCollection('yjs-writings')
-  .find(
-    {
-      // version: 'v1',
-      // docName: '646fd27beff95905ea491a2d',
-      // version: 'v1_sv',
-      // clock: 0,
-      metaKey: 'meta_updatedAt',
-      /*
-      * Filter
-      * fieldA: value or expression
-      */
-    },
-    {
-      /*
-      * Projection
-      * _id: 0, // exclude _id
-      * fieldA: 1 // include field
-      */
-    },
-  )
-  .sort({
-    /*
-    * fieldA: 1 // ascending
-    * fieldB: -1 // descending
-    */
-  });
-// .explain('executionStats');