[PATCH] man2html: Prefer mandoc over groff if it is installed

[Cameron Katri]

Because the patch has some regex to remove html tags my email gets
bounced when the patch is sent normally or as an attachment, so here is
a link to download it https://git.cameronkatri.com/cgit/patch/?id=9bb632056911462379fe345b5638f54a2cd2276c

When using mandoc, sections will have ids and proper spacing, which
groff lacks.

Example:
https://cameronkatri.com/groff.png
https://cameronkatri.com/mandoc.png

-- 
Cameron Katri
Email: me at cameronkatri.com
PGP Fingerprint: 7D3B36CEA40FCC2181FB6DCDBAFFD97826540F1C
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