It is indeed quite basic. You should be able to replace 'markdown' with whatever renderer you want, so theoretically any sort of plaintext -> html tool should work. Alternately, if there's a more full featured markdown renderer you prefer that should work ootb.
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If a dependency on Markdown/sh is acceptable, you might find this[0] to be helpful. I wrote it because I was in much the same boat.
[0] https://git.sr.ht/~evan-hoose/SSSSS
[1] http://a-shared-404.com/blog/stupid-simple-sites/
That looks a tad more basic than what I'd like, but I'll give it a try. Thanks for the links!
It is indeed quite basic. You should be able to replace 'markdown' with whatever renderer you want, so theoretically any sort of plaintext -> html tool should work. Alternately, if there's a more full featured markdown renderer you prefer that should work ootb.