Implement linters for Python, CSS, JS, JSON and YML files

[tunetheweb]

As discussed in #933 (comment) GitHub has a superlinter which will help to find typos and ensure a consistent coding style.

This can run through a GitHub action when a pull request is submitted so the requester gets quick feedback and can correct their code.

Downsides:

• Linting can lead to a large clean up when applying to old code
• It can enforce overly strict rules that annoy more than help. Key is to tune the rules to those useful for us. And change them if we want.

[ibnesayeed]

I can review the code once a PR is up.

[tunetheweb]

Was hoping you would! 😀 Coming right up!