[WIP] Improve Brigadier Documentation

[Strokkur424]

This PR aims to improve the documentation for Paper's new way of declaring commands using the Brigadier API.

Warning

Do not merge this PR yet, as it is incomplete. You can check out the current state of things below:

Roadmap:

Content

• Add Bukkit <-> Paper command comparison
• Introduction page
• Command Tree Structure
• Arguments and Literals
• The executes method
• The requires method
• Native Arguments (StringArgumentType, IntegerArgumentType, etc)
• Registering Brigadier Commands
• BasicCommand
• Minecraft Arguments
• Registry Arguments (The current arguments page)
• Examples
• Common Issues (mainly incorrect braces)
• Quick reference
• FAQ

Finalization

• Add JavaDocs links where ever possible
• Final revision (Mergable)

Reasons for opening a PR:

I wanted to open this PR so that other people could check out the current state of things and help me improve (and potentially even correct me on) the documentation I am writing. I want to make sure that everybody, beginner or advanced, can understand everything written here with ease, because the Brigadier system is less scary than it sounds, yet it is not well documented.

If you want to help contribute:

There is two ways you can help me with this PR:

1. Start a code review and just highlight any issues you see with the current state of things. I will try my best to improve on those issues.
2. Open a PR to my fork/branch. This would make sense for new pages, but for editing existing pages, unless the change is big, I would prefer the first option.

If you have any suggestions...

...please do not hesitate to comment on this PR. I will take all suggestions into consideration.

Let's make the docs even better 🚀

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[olijeffers0n]

Overall, I like these docs a lot. They are very in-depth and offer sufficient examples to allow users to understand them.

Some of the pages can get quite text rich, however most is necessary.