layerchart docs v2

Goals

Provide complete / standalone / isolated examples with easy copy and paste and ability to open in Svelte REPL/Playground or Stackblitz
New Examples browse page with filtering
Automatic find related examples for all components
Expose APIs (generated from $prop() types)
Improved search (sub-section)
Improved design
Better separation of library and docs dependencies

Closes #620

PR also

Adds settings (default layer type and debug)
Layer improvements
- respects layer setting (default)
- integrates debug setting (overall and padding bounds)

[x] Create new docs projects at {project_root}/docs}
[x] Setup content-collections
[x] Setup mdsx
[x] Setup Tailwind / Theme select
[x] Setup unplugin-icons
[x] Setup Svelte UX
[x] Table of Contents
[x] Analytics
[x] Integrate renderContext (svg/canvas/html) setting
[x] Integrate debug setting
[x] Setup CI (build)
[x] Deploy new site to Cloudflare (new directory)
[x] Identify pattern to define examples
- [x] preprocess markdown code blocks
  - Pro
    - Faster to migrate
    - Quick to iterate
  - Con
    - More difficult to implement (find old preprocessor)
- [x] Separate page per example (almost 700)
  - Pro
    - Better tooling (prettier, errors)
    - Easier to implement (?raw for source)
    - Full examples (<script>)
    - Easier to open in REPL
  - Con
    - More intensive (almost 700)
    - Each needs distinct name
[x] Migrate all examples
[ ] Search
[ ] Responsive layout
[ ] light/dark shiki themes
[ ] Remove old site (after migrated)
[ ] Update Getting Started
- New examples, simplified Tailwind integration, shadcn-svelte Charts, etc
[x] Fix screenshots (show full examples (multi-chart), hide controls)
[ ] Fix data warning (box value in object)

[ ] Front page
[ ] Restore API section (related)
- https://github.com/vega/ts-json-schema-generator
- https://github.com/YousefED/typescript-json-schema
[ ] Improved search (include sub subsections)
- discussion
[ ] Navigation between pages
[ ] llms.txt
- https://github.com/techniq/svelte-ux/issues/534
- https://bits-ui.com/docs/llms
- https://github.com/huntabyte/bits-ui/blob/8bb7605696fa28b000f8041c28ed14b99f0710da/docs/svelte.config.js#L21
- https://github.com/huntabyte/bits-ui/blob/main/docs/other/build-llms-txt.ts
[x] Replace <Layer type={shared.renderContext}}> with set value (ex. <Layer type="svg"}>
- [x] settings now integrated (not visible in code examples) so no longer needed
[ ] Docs version select
[ ] Open example in Stackblitz (example)
[ ] Open example in Svelte REPL (example)
[x] Support opening example directly (useful for development / investigation)
[ ] Examples
- https://github.com/techniq/layerchart/issues/150
- https://github.com/techniq/layerchart/tree/next/examples
- https://github.com/techniq/layerchart/network/dependents
- Discord showcase
[ ] Social / OG images
- https://geoffrich.net/posts/svelte-social-image/
- https://github.com/WarningImHack3r/svelte-changelog/pull/101
- https://github.com/huntabyte/bits-ui/blob/main/docs/src/lib/components/metadata.svelte
[ ] Type hovering
- twoslash-svelte PR
  - Usage: https://svelte.dev/docs/kit/load

I'm also thinking we have the following sections (not rigid, but general ideas):

Homepage
Guides / Features
- Getting started (including linked to the new integration examples
- Concept explanations
- I have a start on some of this concept, but could use some help building it out / polish.
- This would including explaining simplified charts and pro/cons (but see note below)
Showcase
- Sites using LayerChart (open and closed source)
- Github Analysis, Strava Analysis, Zipline AI, posts to Discord showcases, callout some bigger ones in github dependents, possibly form to submit yours (would like to keep them high quality)
Examples
- show more built out examples (can be tricky to draw the line with some of the docs examples)
- screenshots / previews
  - https://observablehq.com/@observablehq/plot-gallery
  - https://svelteplot.dev/examples
Docs / APIs
- show/explain more concepts, but tricky sometimes to draw the line with examples
- component previews / screenshots on listing page
  - https://lunarui.dev/components
  - https://ant.design/components/overview
  - https://chakra-ui.com/docs/components/concepts/overview
  - https://atlassian.design/components
  - https://charts.carbondesignsystem.com/introduction