docs: Solid Meta v1 documentation for the 1.0 release (#1616)

* docs: add Solid Meta v1 documentation for the 1.0 release

Solid Meta 1.0 (for Solid 2.0) is provider-less and built on the core
useHead registry, so its docs get a versioned section following the
same pattern as SolidStart v2: content under src/routes/solid-meta/v1
with a v1 entry on the version axis, its own sidebar, and a Latest/v1
switcher on Meta pages. Covers getting started, a 0.x migration guide,
and reference pages for all components including the new <Head> groups,
<Script>, and the useHead escape hatch, with cross-links between the
0.x and 1.x overviews.

Co-authored-by: Cursor <cursoragent@cursor.com>

* ci: apply automated fixes

* docs: drop useHead reference page — the primitive lives in @solidjs/web

@solidjs/meta 1.0 no longer re-exports useHead, so the meta v1 reference
documents components only; the migration guide now points useHead callers
at the core import from @solidjs/web.

Co-authored-by: Cursor <cursoragent@cursor.com>

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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>