BREAKING CHANGE: Upgrading to Halfmoon v2.0

[reinhart1010]

HAM is currently being upgrading into Halfmoon 2.0, which is now based on Bootstrap instead of custom CSS.

This also means that class names will be updated to reflect that of Bootstrap, and there might be some CSS variables which might change.

If you are using HAM for GitHub Pages, we recommend to convert your existing pages to GitHub Actions-based deployment, using the following version of HAM in your Gemfile:

gem "jekyll-ham", "~> 0.3.3"

The final version number will be bumped into 1.0.0.