Really need to support HTML content files.

I just ran into the limitation that content files must be markdown. This makes it impossible to put non-trivial HTML in the file. I had hoped Zola would be a good alternative to Jekyll, but this (and not using Tera in the content files) and the required workarounds (make a template for each content file you want like this) is pretty clunky.

Issue #2420 covers this, but was closed with the comment that this won't happen. Seems a bit opinionated, no?