Promote develop → main: live PyPI badge and top-bar position (docs only, no version bump)

[tbolis-at-mulesoft]

Promotion of develop → main. Docs-only; no version bump (explicitly bypassed —
develop and main both stay at 0.1.1, so no new tag/release is cut).

Included

• docs: read the PyPI badge version live with a 5-minute cache #921 — read the PyPI badge version live with a 5-minute cache (closes Keep the PyPI version badge current right after a release #920)
• docs(website): move the PyPI badge before the search field #923 — move the PyPI badge before the search field in the docs-site top bar (closes Move the PyPI badge before the search field in the docs-site top bar #922)

Notes

• Touches only README.md, python/README.md, website/app/layout.tsx,
  website/styles/globals.css. No SDK code, no extras changes, no §0.3 verification-status changes.
• On merge, the Pages deploy (docs.yml, push to main) publishes the new top-bar badge
  to docs.donkey-kit.dev.
• python/README.md reaches the PyPI project page only with the next release (0.1.2).
• Not a milestone release: Phase 1.2 — Stabilize the MVP (0.1.2) has 30 open issues and
  stays open.

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