Tag documentation pages

[hugopeek]

Some possible categories might be: indicate if it's a turorial, topical guide or reference material (although reference material will be kept in the Backyard package mostly). Or high-level / low-level, combined with an indication of difficulty (basic/intermediate/advanced).

For a good description, see: https://jacobian.org/writing/what-to-write/

[hugopeek]

In addition: find out if there's a generic way to include these tags in the Overview templates. Maybe even with different colors for each tag.