This PR removes dotenv and nodemon and switch to native Node.js environment handling [express-mvc-esm]

[MehediMubin]

Summary

This PR removes dotenv and nodemon from the project and updates the development setup to use Node.js's built-in environment variable handling and the --watch feature.

Changes Made

• Removed dotenv and nodemon from package.json.
• Updated config/index.js to use process.env directly without dotenv.
• Updated the start script in package.json to:

  "start": "node --env-file=.env --watch ./src/server.js"
  

• Verified that the app runs correctly with the new setup.
• It Closes Remove dotenv and nodemon and switch to native Node.js environment handling [express-mvc-esm] #71