Feature/client formatting linting

[thmsndk]

Adds eslint and prettier to the js folder

I would also like to add eslint/prettier to the htmls folder that python servers, but i'm not sure how to do that and if it is a good idea. it is not normal html, it uses a python library to process the html and replace variables

[Telokis]

Big undertaking.

I think it's a good opportunity to also add the rule prefer-template.

[thmsndk]

I can look into adding prefer-template

I was also strongly considering configuring newlines for certain places https://eslint.style/rules/js/padding-line-between-statements (this seems to be latest version, and requires some upgrading to @stylistic/eslint-plugin-js.) it makes the code way more readable imho.