move dotenv config from server index to the config file

backend/src/server.ts

@@ -1,11 +1,7 @@
 import express from "express";
-import dotenv from "dotenv";
 import * as bodyParser from 'body-parser';
-
 import * as routes from "./routes"
 
-dotenv.config();
-
 const app = express();
 app.use(bodyParser.json());