Render wikilinks before rendering docs with GFM

[tijptjik]

Fixes #8

[gordonbrander]

Tested locally. Unfortunately, this breaks transclusion. The reason is that Markdown runs first, so it wraps wikilinks in a <p> tag. This is Markdown behaving as expected. We should run any to-HTML transformations BEFORE running markdown, since Markdown is supposed to leave HTML alone. The issue is that the GFM library has a bug where it does not leave HTML alone.

Will investigate another fix.

[tijptjik]

Thank you for investigating... and indeed there way no transclusion in the Obsisian.md use-case. I've adopted a work-around like you suggested in the meantime... but would it be worth checking whether another GFM parser (e.g. cmarkgfm or pycmarkgfm doesn't have this bug? Thanks, just saw your comment you were thinking along the same lines :)