Update Docs to 1.21.8

[dicedpixels]

supersedes and closes #316
supersedes and closes #331
closes #344

Maintainer TODO:

• fix Developer Guides: Model generation #319
• fix SwordItem class not found? #325
• fix "validateTicker" NOT FOUND #333
• fix missing reference to item model definition #337
• fix Screen documentation for ~1.21.6-1.21.8: Change in functionality to color arguments in text rendering methods #340 (thx @cassiancc)
• review "Rendering" content
• compare with Update to 1.21.5 #316 (thx @modmuss50)
  • "appendTooltip is now deprecated, should it be using components?"
• compare with Update to 1.21.5: Block Model Generation #331 (thx @Fellteros)

Original Comment

Changes

Reference Mod:

• Update Gradle, Loom, Fabric API, Fabric Loader to support 1.21.8.
• FabricDocsReferenceItemTagProvider now extends FabricTagProvider.ItemTagProvider, docs are updated to reflect this.
• HudRenderingEntrypoint now uses HudElementRegistry, docs are updated to reflect this.
• RenderingConceptsEntrypoint commented out. I couldn't figure this out.
• Regenerate all JSON files.
• CounterBlockEntity now overrides writeData and readData, docs are updated to reflect this.
• FabricDocsReferenceCommands has a new call to cast. Vanilla also does this.

Docs:

• Block Entities/Saving and Loading Data → Updated to reflect WriteView/ReadView changes. Text adapted from the Fabric blog.
• Data Generation/Block Model Generation/Custom BlockModelDefinitionCreator Method → Now based on the new code. Text is also updated.
• Data Generation/Tag Generation → Now updated to use FabricTagProvider.ItemTagProvider. The generic tag generation process is mentioned.
• Items/Tools and Weapons → Includes a mention to REPAIRS_GUIDITE_ARMOR.
• Items/Custom Armor → Includes a mention to REPAIRS_GUIDITE_ARMOR.
• Loom → Fix broken link to Getting Started/Introduction to Fabric and Modding page.
• Rendering/Rendering in the HUD → Updated for HudElementRegistry and references to tickDelta are replaced with tickProgress.

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[dicedpixels]

Removed the Basic Rendering Concepts page from the navigator and 2 links that were pointing to it. The remaining rendering pages should be isolated enough to be on their own. Once someone helps out with the rendering changes, we can add them back.

[cassiancc]

My two cents on appendTooltip - it's still the only good way to add a tooltip to an item, not a component. While having docs on the ComponentTooltipAppenderRegistry would be a worthwhile enhancement, it should not be a blocker on this PR while appendTooltip still exists and functions as intended.

[modmuss50]

Lets just merge this, any issues can be fixed in follow up PRs. Big thanks for this.