Render markdown files in tree view

[Lukasz Janyst]

Hey there,

First of all, thanks for all the great work on cgit. Awesome stuff!

In my setup, I like to have the markdown files in the repos rendered as
HTML instead of having them highlighted as code. Turns out it's fairly
easy to achieve using filters. I attach the necessary patches. Feel free
to commit if you think they are generally useful.

Cheers,
   Lukasz
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