[code-infra] Ship docs markdown inside @base-ui/react package

[Janpot]

Adds the generated documentation markdown into the published @base-ui/react tarball under a docs/ folder, so consumers can read it from node_modules/@base-ui/react/docs/.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4761
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4761
  

commit: c87d0c1

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	0B(0.00%)	0B(0.00%)

Details of bundle changes

Performance

Total duration: 810.96 ms ▼-492.47 ms^(-37.8%) | Renders: 50 ⁽⁺⁰⁾ | Paint: 1,254.55 ms ▼-752.01 ms^(-37.5%)

Test	Duration	Renders
Select mount (200 instances)	93.90 ms ▼-79.64 ms(-45.9%)	3 (+0)
Tabs mount (200 instances)	151.82 ms ▼-78.44 ms(-34.1%)	4 (+0)
Slider mount (300 instances)	104.44 ms ▼-65.11 ms(-38.4%)	3 (+0)
Menu mount (300 instances)	91.56 ms ▼-56.21 ms(-38.0%)	2 (+0)
Mixed surface mount (app-like density)	53.49 ms ▼-36.10 ms(-40.3%)	5 (+0)

…and 7 more — details

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Check out the code infra dashboard for more information about this PR.

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