chore: cleanup some docs, add lazy load docs

[DylanPiercey]

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[coderabbitai]

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: 0305b95e-8353-4105-877e-0a4a06ff050d

📥 Commits

Reviewing files that changed from the base of the PR and between 83a183c and 66a3013.

📒 Files selected for processing (11)

• docs/explanation/fine-grained-bundling.md
• docs/reference/core-tag.md
• docs/reference/custom-tag.md
• docs/reference/language.md
• docs/reference/lazy-loading.md
• docs/reference/reactivity.md
• docs/reference/template.md
• docs/reference/typescript.md
• src/routes/docs/_llms/reference-full%2emd+handler.ts
• src/tags/app-menu/app-menu.marko
• src/util/markodown.ts

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Walkthrough

This PR updates the Marko website documentation to add comprehensive lazy-loading reference docs for custom tags and modernizes documentation for Marko 6. It introduces new instance.value and $global.renderId API documentation, updates TypeScript type references to use Marko 6's runtime-tags definitions, documents the lazy tag import syntax with trigger types, and fixes reference links and anchors throughout. Site infrastructure is updated to include lazy-loading in navigation and reference generation, and a filename regex is broadened to allow + characters in code-block headers.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch lazy-load-docs

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