Add wiki / gollum tag support in comrak

This adds support for comrak's new wikilinks_title_after_pipe and wikilinks_title_before_pipe options.

We use the new release of comrak,

• https://github.com/kivikakk/comrak/releases/tag/v0.24.1
• https://github.com/kivikakk/comrak/compare/0.23.0...v0.24.1

Closes #15 (closed)