Update to 1.21.2

[ChampionAsh5357]

Applies the contribution formatting and updates the docs to 1.21.2. This is a separate section due to the large number of changes between versions.

Waiting On

• neoforged/Neoforge#1620
• Xfact's updates to IClientExtensions for armor model setup

Relevant Issues

Closes #177 Closes #179 Closes #180 Closes #181 Closes #183 Closes #196 Supersedes #174

Subsections

• [x] Advanced
• [x] Block Entities
• [x] Blocks
• [x] Concepts
• [x] Data Storage
• [x] Getting Started
• [x] GUI
• [x] Items
• [x] Legacy
• [x] Misc
• [x] Networking
• [x] Resources
  • [x] Client
    • [x] Models
  • [x] Server
    • [x] Data Maps
    • [x] Enchantments
    • [x] Loot Tables
    • [x] Recipes
• [x] World Generation

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[ChampionAsh5357]

Gonna mark this as ready for review since I'm just waiting on two PRs from NeoForge: one of mine to expose the recipe map, and one from xfact about the armor model client extensions.

[ChampionAsh5357]

I have resolved everything I plan to implement in this PR. Anything else I'm leaving out for a separate PR.