Add noxfile and remove lint

[mcflugen]

I've added a nox file for running routine maintenance tasks like building the docs, running the tests, building the examples, checking for lint, etc. I've also changed to using pre-commit to run the linters and check for much more lint than before (I've removed all of the newly found lint). The ci tests have been simplified to use nox.

Other things included in this pull request,

• Combined all of our linters (including black) into a single workflow that runs nox -s lint
• Dropped Python 3.8 but haven't added 3.11 yet
• Updated the readthedocs config file as it was way out of date
• In the template pyproject.toml file, require setuptools<60. This is necessary when building fortran extensions because numpy has dropped support of distutils and are in the process of switching the Meson
• Switched from a mix of Google and numpy style docstrings to just numpy syle. It's what we use everywhere else.
• Removed the deprecated wrap.py module.
• I cleaned up the language tests but, in the end, I've moved the language testing into the nox file. I think it's easier to read there and is less spaghetti like.

[mcflugen]

@mdpiper When you have a chance would you please have a look at this pull request. Thanks!

In case you're interested, the docs are building on rtfd.

[mdpiper]

A minor issue I can work around, but I want to mention it just in case I'm missing something.

In building the C example:

$ nox -s "build-examples(lang='c')"

it doesn't like the mamba backend:

ValueError: Expected venv_backend one of ('virtualenv', 'conda', 'venv'), but got 'mamba'.

I can edit the noxfile to use conda instead.

[mcflugen]

@mdpiper That's weird. What version of nox to you have? I assume you have mamba installed?

You don't need to modify the noxfile to change the backend. The following should override the backend declared in the noxfile,

nox --force-venv-backend=conda -s "build-examples(lang='c')"