Update the CAIL Pi guide for 0.4.0

[szweibel]

Rewrites /docs/cail-pi for CAIL Pi 0.4.0 (cail-pi#4).

Merge only after npm serves @cuny-ai-lab/cail-pi@0.4.0 as latest. Until then, the new pi install steps would install 0.3.0, and the old page's npx steps still work. After 0.4.0 is latest, the reverse holds.

What changes on the page

• Install: Pi's own installer (curl … | sh, or irm … | iex on Windows), then pi install npm:@cuny-ai-lab/cail-pi. Node.js, Git and npx are no longer prerequisites. Visible "macOS or Linux" and "Windows PowerShell" labels above the two installer blocks, since CopyCode labels are only aria-labels. The page tells readers to type n at the installer's "Start pi now?" prompt, because the next step runs in the terminal.
• Sign in: /login cail → Sign in with CUNY AI Lab (CUNY Login, Connect Pi), the copy-code flow over SSH, and pasting an API key as the alternative. Names the expected "no default model is configured" message.
• New sections: picking a model, optional web search (pi-web-access, pi-ask-user), and moving from the earlier npx/LazyPi setup with pi update --all.
• Troubleshooting uses /cail in place of --doctor. The Pi 1.0 upgrade section and the installer flags are removed, along with the npx installer.
• The resources and guides cards drop "in one command".

Verified

• bun run check (audit, Oxlint, astro check, build) passes locally.
• The built page rendered in Chromium at 1280 px and 390 px with all ten sections and the sidebar links.
• The commands match what I ran against Pi 1.2.0 for cail-pi#4: pi install, a real model call, and pi update. Pi's installers at pi.dev/install.sh and install.ps1 return 200.

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