Inline HTML is not a very clean code best practise

[tomvlk]

Better move to a templating engine, or at least split the different routes to different JS files? This way it improves the readability of the code, removes additional clutter, and makes it less easy to make mistakes when adjusting things. Also it makes it easier for any frontender to work on the project if the person doesn't have much experience in backend.

Example: https://github.com/voltbonn/volt.link/blob/main/backend/index.js#L283