Improve Brigadier Documentation

[Strokkur424]

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

Tip

I suppose this PR is now mergable. Not all content points have been included yet, but I will be declaring seperate PRs for those. This PR is big enough as-is

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 (Separate PR)
• Custom Arguments (Separate PR)
• Common Issues (Separate PR)
• Quick reference (Separate PR)
• FAQ (Separate PR)
• Advanced (dispatcher and fork) (Separate PR)

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]

The docs are really good. Couple of nitpicks that i saw though.

I am concerned about the video file size a little bit. One is 20MB. These could be compressed potentially but unsure if this is the best route to take. I know this was discussed in the past

[Strokkur424]

I am concerned about the video file size a little bit. One is 20MB. These could be compressed potentially but unsure if this is the best route to take. I know this was discussed in the past

I haven't been made aware of any such discussions. If you wish, I can reduce the file sizes a bit

[Strokkur424]

I reduced the file sizes very drastically whilst still keeping it somewhat high-quality. Hopefully that should be enough?

[zlataovce]

needs a redirect to not kill existing links

[zlataovce]

needs a redirect to not kill existing links