Automatic publishing

[jwnrt]

The hamburger menu has broken again, and it looks like the same issue as last time (#8):

1. The site is loading conflicting versions of bootstrap's collapse.js and jQuery.
2. The versions used in the source repo's yarn.lock are up to date and compatible.
3. This repo somehow has duplicate copies of the JS and CSS where one is broken and being used by all the HTML files - currently main.90781.js (broken) and main.b0a63.js (working).

Since this seems to be a problem with how this repo is being generated, could we automate the build + publish steps?

Here's an example GitHub Actions setup for building a Hugo site when the main branch changes, and publishing the site from the directory of generated files: https://github.com/peaceiris/actions-hugo#getting-started.

There are some files in this repo not generated from the source, e.g. CNAME, and README.mkd (likely not needed if publishing from the lowrisc-web repo instead). Including these in the source would remove the extra state from this repo.

[mundaym]

Sounds good to me