Speed up dev build by limiting collections

[adamscott]

Note

I forked the original repo for my fork because I needed to add missing features with limit_collections and to enable the parallel functionality, even if I didn't include it in this PR. (it messes up with the localization of the website)

This PR speeds up the dev build time my limiting the number of collection items processed. It nearly halves the dev build time.

Before	After

Please note that it will take the latest collection entries, so you'll need to tweak the _config.development.yml file if you need to edit an old blog post (or other hidden content).

Warning

I had to update GitHub workflows to use ruby 4.0 to make it work with my fork.

[Calinou]

Ruby 4.0 isn't in either Ubuntu nor Debian repositories (not even Debian testing), so it's kind of a dealbreaker for local builds if it's now required. This would effectively put a hard requirement on building in a container or using mise for contributors.