Docs site pivot + reduction + link cleanup (Memo 142)

[a6b8]

Context

Messaging pivot and reduction pass on the docs site. FlowMCP is positioned as a schema format, not an MCP server; the surface is cut down to what matters; the auto-generated spec/grading/best-practice content is re-synced from the cleaned source.

Changes

Pivot (EN + DE):

• Hero.astro: headline → "Schema-driven data access for AI agents." (scale moves into the tagline/mission).
• About: format positioning + value-prop (write the connection once, reuse everywhere; schema kept separate from grading and security), and a Swagger/OpenAPI distinction; the "production-ready" data-source boast is defused.

Generator (AUTOGEN lever):

• scripts/sync-spec.mjs: drop the visible "Auto-generated" aside from every synced page (provenance stays in frontmatter).

Reduction (default-out, reversible — moved to .trash/, never deleted):

• Removed FAQ, Use Cases, Schemas & Sources, the guides (Hackathon Kit / Agent Creation / GTFS Pilot), the whole Reference section, and the whole Ecosystem section — plus their German mirrors and the templates that would otherwise regenerate them.
• Removed the stale route-tests page (a nav-filtered v4.0.0 orphan).
• astro.config.mjs: removed the matching sidebar groups; repointed ~15 legacy redirects to surviving pages.
• Fixed all inbound links from surviving pages/components to the removed routes (CLI refs → quickstart, license → spec license page, etc.).

Content:

• Re-synced the 57 generated spec/grading/best-practice pages from the cleaned source; added lead intros to the concepts pages.

Verification

• astro build: green, 174 pages.
• 0 dead links to removed routes; signpost deep-links resolve; no "Auto-generated" asides remain.