CCV2 Conceptual docs

[sfc-gh-dmatthews]

📚 Context

The parent branch (apps/custom-components-concepts) added example apps and the quickstart page for Custom Components v2. This branch adds the full conceptual documentation for CCV2, restructures the existing custom components section to accommodate both v1 and v2, and updates navigation accordingly.

🧠 Description of Changes

• Restructured the Custom Components section into a versioned hierarchy: added a new landing page (_index.md), an Overview page comparing v1 vs v2, a dedicated Components v1 subsection, and a new Components v2 subsection.
• Moved existing v1 docs (components-api.md, create-component.md, limitations.md) into a components-v1/ directory with updated slugs, and created a v1 index page preserving the original content.
• Renamed publish-component.md to publish.md (shared across v1/v2).
• Added 16 new CCV2 concept pages under components-v2/:
  • _index.md — v2 landing page with tile navigation
  • register.md — component registration (HTML/CSS/JS definition)
  • mount.md — component mounting and output handling
  • communicate.md — bidirectional communication
  • state-and-triggers.md — state values vs trigger values
  • theming.md — theme integration and CSS custom properties
  • package-based.md — building distributable TS-based components
  • examples/ — 8 quickstart example pages (hello world, rich data, simple button, simple checkbox, interactive counter, text input, danger button, radial menu)
• Added overview.md — a new top-level overview comparing v1 and v2 with a feature comparison table.
• Added component-communication-cycle.svg diagram illustrating bidirectional data flow.
• Updated content/menu.md to reflect the new section hierarchy with all new pages in the sidebar nav.
• Updated public/_redirects to point legacy v1 URLs to their new components-v1/ paths.

Current:

The Custom Components section has a flat structure with only v1 docs (Intro, Create, Publish, Limitations).

Revised:

The Custom Components section is now versioned with an Overview, a full Components v2 subsection (7 concept pages + 8 example pages), a Components v1 subsection, and a shared Publish page.

💥 Impact

Size:

• Small
• Not small

🌐 References

• Notion

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.

[sfc-gh-dmatthews]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• CCV2 Template Tutorials #1434
• Better diff highlighting for code blocks #1433
• CCV2 Conceptual docs #1432 👈 (View in Graphite)
• CCV2 Embedded apps for concepts #1431
• main

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