Migrate to Hugo

[tsa96]

Jekyll sucks, we've been wanting to migrate for ages, finally gone and done it.

Closes https://github.com/momentum-mod/docs/issues/313

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[tsa96]

Addressed your above comments. Few things I still need to do:

• Update README.md
• Update "Creating docs pages" guide
• Fix styling on Firefox (unsupported :has selector)

[tsa96]

Okay, I'm happy with this. @Gocnak feel free to do any further review now, or merge if you're happy.