Set up Cursor Cloud development environment

[edmundmiller]

Summary

Sets up and verifies the development environment for the nf-core website (Astro mono-repo with npm workspaces) and documents durable startup/run notes for future cloud agents.

• Adds AGENTS.md with a ## Cursor Cloud specific instructions section describing the sub-sites, how to run/lint/test them, and non-obvious gotchas.
• Configures the VM update script to npm install (installs both root and workspace dependencies; --workspaces alone misses root devDeps like prek/prettier).

No application code was modified.

Verification

• Dependencies installed via npm install.
• main-site dev server runs at http://localhost:4321/ (HTTP 200, title nf-core).
• Lint (CI gate): prek run --all-files → prettier Passed.
• Tests: npm run test -w sites/main-site -- --project=chromium → 4 passed.
• Hello-world: browsed the live dev site in Chrome — homepage rendered, dark-mode toggle worked, navigated to /about.

nf_core_website_dev_demo.mp4

Homepage (light mode)
Homepage (dark mode)
About page

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[mashehu]

duplicate of #4246 I think