Better help command

[vyPal]

Description

A much nicer and more practical help command.
Also adds pagination to help manage large numbers of commands.

Testing

Tested on local copy of server (arch linux)

Checklist

Things need to be done before this Pull Request can be merged.

• Code is well-formatted and adheres to project style guidelines: cargo fmt
• Code does not produce any clippy warnings: cargo clippy
• All unit tests pass: cargo test

[Snowiiii]

Looks very nice.
Good job @vyPal 👍