Tests and docs workflow

[meganasampson]

The following changes should run tests and deploy docs that have been created to github pages when pushed to main.

To see docs locally before on main:

Run

zig build docs

To build docs into /zig-output/docs from /docs

Run

python -m http.server 8000 -d docs/

To view on local test web server

The docs have been generated with -femit-docs as seen here. They are not the best and only touch on the zig portion of the code for now. Can change to prioritise the python if you'd rather, but this is a start.

[james-panayis]

This looks great! I've just done a few changes (mostly making the docs generate during the CI instead of committing them directly, and adding the python tests).