Documentation around no-internal-hashes & automated GitHub Pages deployments

[Stealthii]

I tried an experiment around using no-internal-hashes for a GitHub hosted pack, whilst also generating the hashes and hosting via GitHub Pages on successful builds via Actions.

https://github.com/PepsiDogs/pepsipack/blob/main/.github/workflows/packwiz.yml

It might be nice to draft up some documentation around this process, along with a skeleton repo that can be used as a blueprint or starting point.

[comp500]

I've moved this to the website repo, since this is where the majority of documentation is :)

I do already have an example modpack at https://github.com/packwiz/packwiz-example-pack, though it doesn't use no-internal-hashes. We could add a no-internal-hashes variant on a branch?