Collapsey boxes for the help command

[abyxcos]

Can the top level help command gain collapsey boxes per generic section so that it doesn't fill scroll history on mobile with 3-4 pages of commands?

[Gnuxie]

https://github.com/Gnuxie/Draupnir/pull/33

I think I'm going to merge this PR before trying to improve it further as commands still need documentation.

Follow up would mean:

• [ ] Document more parameter descriptions
• [ ] Allow for options and repeatable arguments (rest descriptions) to appear in help
• [ ] Think about what to do with common parameters e.g. entity in search/ban/unban.
• [ ] Think about how to get rich text in examples and longer descriptions
• [ ] Think about what to do instead of detail and summary in fallback