[discussion] Site generator options?

Currently, [fontra-docs](https://github.com/fontra/fontra-docs) is built with Jekyll. This is a Ruby-based static site generator, which, in my option, is a little dated and always brings me great pain to install and run locally.

On the other hand, [fontra-blog](https://github.com/fontra/fontra-blog) is built with the JS-based [11ty](https://www.11ty.dev/) static site generator. This is easy to set up with npm, but also has a bit of a learning curve.

Both use .md files for sources, but I bet there are tons of differences in the details, especially with how to set up navigation and/or templating.

Ideally, we would move the documentation to 11ty, as it's more modern and light-weight. Perhaps the magic tooling can be used to convert the Jekyll .md files to 11ty-style.

There may be other viable options to build our docs site from .md files.

(Note: whatever we end up doing, it would be great if existing URLs into docs.fontra.xyz would remain valid, although I'm not opposed to redirecting.)

Compare the Jekyll setup in fontra-docs with the 11ty setup in fontra-blog, starting with how each handles Markdown, navigation, and templating. Inventory existing docs URLs and determine whether redirects are needed. Done means documenting a chosen generator and an agreed migration plan that preserves or redirects those URLs.

Written by the indexing model from the issue text.