[alexshapalov]

README changes, matching the pgbot and orca README layouts:

• A centered row of section links right under the badges: Quickstart · Agents · Why PGX · Benchmarks · Architecture · Status · Docs. All anchors point at existing headings.
• A star-history chart (star-history.com, pgrundev/pgx, as of 2026-11-02) at the very end of the README, committed as docs/pgx/img/star-history.png and linked to the live star-history page.
• A compact README: 661 → ~480 lines, with no text dropped from the repo.
  • Why PGX, At a glance, Disposable Postgres and Built for agents merge into one Why PGX section.
  • Benchmarks keeps the headline numbers and the caveats (regression figure is not a compat %, not faster than PG in general); the tables, isolation results and reproduction steps move verbatim to docs/pgx/benchmarks.md.
  • Build from source, Run a PGX runtime and Make a template and mint databases move verbatim to docs/pgx/local-dev/build-from-source.md; install.md now points there instead of at the README.
  • Status absorbs PGX + PGRun; Quickstart folds the branching subsection into the command list.
• Architecture replaces How it works as an orca-style feature wall: five rows, text left, visual right.
  • One runtime, thousands of databases carries a recording of the density grid as a GIF (docs/pgx/img/arch-density.gif, 4.2 MB, 600 px, 6 fps) with a JPG poster for clients that do not play GIFs.
  • Mint-on-connect, Copy-on-write storage, Limits at every level and A branch per agent use text diagrams with the measured numbers; swap in a recording for each when one exists.
  • The limits example uses the real error text and the real pgrust_runtime_status() field names from the docs.

All relative links and nav anchors were checked by script. No code changes.

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