Build the docs with @pmndrs/docs@4

[abernier]

static.yml builds the docs by running ghcr.io/pmndrs/docs:2 inline. That image is no longer published — v4 of pmndrs/docs ships as an npm CLI instead — so this swaps the docker run for:

- run: npx -y @pmndrs/docs@4 build docs out --format website

Same environment variables, minus the three the CLI now derives itself:

• MDX → the positional docs argument
• OUTPUT / DIST_DIR → the positional out argument. BASE_PATH is still honoured, and the CLI copies the exported site to out, so upload-pages-artifact points at out instead of docs/out/xr/docs. The artifact keeps exactly the same layout, and bundle-artifacts / deploy are untouched.

The pnpm -r generate:docs step is kept — that is why this repo cannot simply call the reusable pmndrs/docs/.github/workflows/build.yml, which has no hook to run anything before the build.

Side effect worth having: from v3.2.0 the generator publishes /llms-full.txt, so once this lands https://pmndrs.github.io/xr/docs/llms-full.txt exists and the xr docs become readable by the pmndrs MCP server and the pmndrs-docs CLI, like drei, zustand and r3f already are.

🤖 Generated with Claude Code

https://claude.ai/code/session_0189fTPDjQHrqHxdaMkKCcEC