Pelican [1] can translate markdown to html. However, I think read the docs [2] and Sphinx [3] are more suitable for a wiki (but it uses RST). Also, you can use themes [3].

[1] https://docs.getpelican.com/en/latest/

[2] https://readthedocs.org/

[3] https://www.sphinx-doc.org/en/master/