Mkdocs for Docs

[felixfontein]

@samccann

My nickel is leave it to Galaxy if you do not have any extra guides (as in you have plugin docs and a readme). Galaxy will likely outperform your individual collection docsite on search results.

Right now be warned that Galaxy does not render role argument specs (not sure whether there’s an issue tracking that, since galaxy_ng does not use GitHub for issues), and it does not render documentation of plugins that use docs fragments from other collections (Galaxy importer: collection dependency handling, no idea whether there’s anything in galaxy_ng’s issue tracker for that either).