Fix GitHub Pages publishing references

[pollockjj]

Summary

• point release install notes at the Comfy-Org GitHub Pages wheel index
• document the live PEP 503 index URLs and the gh-pages deployment flow
• grant the standalone update-index workflow the same Pages permission used by build.yml

Verification

• python -m pytest tests/test_generate_index.py tests/test_generate_matrix.py
• git diff --check
• gh workflow run update-index.yml --repo Comfy-Org/wheels --ref main
• gh run watch 24755469372 --repo Comfy-Org/wheels --exit-status
• curl -fsSL https://comfy-org.github.io/wheels/v2/
• curl -fsSL https://comfy-org.github.io/wheels/cc-torch/

[Copilot]

Pull request overview

Updates documentation and workflow metadata so GitHub Pages publishing and installation instructions correctly reference the Comfy-Org wheel index, and aligns the standalone index update workflow permissions with the release pipeline.

Changes:

• Update README build instructions and document the live PEP 503 index URLs and gh-pages publishing flow.
• Update release notes template in build.yml to point installs at https://comfy-org.github.io/wheels.
• Add pages: write permission to the standalone update-index.yml workflow.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
README.md	Updates workflow invocation repo and documents the Pages index URLs + deployment flow.
.github/workflows/update-index.yml	Adds Pages permission to the standalone index deployment workflow.
.github/workflows/build.yml	Updates release install notes to reference the Comfy-Org GitHub Pages wheel index URL.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

pages: write permission appears unnecessary for this workflow because deployment is done via peaceiris/actions-gh-pages, which pushes to the gh-pages branch using contents: write. Keeping pages: write expands GITHUB_TOKEN scope beyond what’s needed; consider removing it (or only adding it if migrating to the official Pages deployment actions that require pages/id-token permissions).

Suggested change

pages: write