[codex] Fix docs image base URLs

[GarlicGo]

Summary

• Use Docusaurus useBaseUrl() for raw HTML docs figures so static image paths include the /docs base URL.
• Fix the session recap figure from [Bug]: session-recap.svg not loading in docs #24809 and the adjacent CLI layout figure with the same root-path pattern.

Root cause

The docs site is configured with baseUrl: "/docs/", but raw HTML <img> tags kept absolute /img/docs/... paths. In production those resolve outside the docs base path and can 404 even though the static asset exists.

Fixes #24809

Validation

• npm run build from website/ completed with exit code 0. Existing Docusaurus broken-link/broken-anchor warnings remain unrelated.
• Verified generated HTML includes /docs/img/docs/session-recap.svg and /docs/img/docs/cli-layout.svg, with no remaining root /img/docs/... path for those figures.

[alt-glitch]

Duplicate of #24824 (and overlaps with #27394 which was already marked duplicate of #24824). All three PRs fix the same useBaseUrl() / base path issue for docs image <img> tags in sessions.md and cli.md. #24824 uses the idiomatic Docusaurus approach.

[GarlicGo]

Duplicate of #24824 (and overlaps with #27394 which was already marked duplicate of #24824). All three PRs fix the same useBaseUrl() / base path issue for docs image <img> tags in sessions.md and cli.md. #24824 uses the idiomatic Docusaurus approach.

ok