delete some imports

backend/src/index.ts

@@ -34,5 +34,6 @@ connectToDatabase()
   })
   .catch((error: Error) => {
     console.log('Database connection failed');
+    console.log(error.message);
     process.exit();
   });

backend/src/routes/links.router.ts

 import express, {Router, Request, Response} from 'express';
-import {ObjectId} from 'mongodb';
 import {collections} from '../services/database.service';
 import Link from '../models/links';
 import shortid from 'shortid';