markdown: Handle local links

By default, the markdown generator creates links for local files
transparently. For example, "[text](link.md)" will generate
"<a href=link.md>text</a>".

This works fine for absolute and external links, but breaks for links
relative to the repository itself, as git-arr links are of the form
"dir/f=file.ext.html".

So this patch adds a markdown extension to rewrite the links. It uses a
heuristic to detect them, which should work for the vast majority of
common cases.

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