Experiment with remote snippets

[pi0]

While playing with some ideas, taught to share to gather opinions about this method of the README.md population!

An example: https://github.com/unjs/.github/tree/main/snippets

[HugoRCD]

Adding a system of variables that are automatically replaced during fetching could be a good addition to this already really great feature I think 🤔
Something like this, for example:

<!-- automd:fetch url="gh:unjs/.github/main/snippets/readme-footer.md" variables=[{key: author, value:pi0}, ...]
Made by ${author}
<!-- /automd -->

<!-- automd:fetch url="gh:unjs/.github/main/snippets/readme-footer.md" variables=[{key: author, value:pi0}, ...]
Made by pi0
<!-- /automd -->