Since python doesn't have a way to lock deps for a particlar project by default, I didn't bother with it. This resulted in mkdocs updating at some point, bringing a breaking change to how tabs are declared and broken tabs on docs-develop.pleroma.social. I've learned my lesson and locked deps with pipenv in docs!5 (merged). This MR updates Pleroma docs to use the new tab style, fortunately my editor did most of it.
Closes #2045 (closed)