docs(newos4): install pi + point it at Ollama; fix dead /about/ link

Install is npm (node>=22.19). Ollama wiring is two files under ~/.pi/agent:
models.json (baseUrl http://localhost:11434/v1, api openai-completions, model
list) and settings.json (defaultProvider/defaultModel). Documents the trap that
a pulled model must also be declared — undeclared gives 'Model not found', which
reads like a connection failure. Both paths verified on this host: declared
coder:latest -> 'LOCAL OK', undeclared llama3.2:latest -> error.

The two /about/ links pointed at the host root, where nothing exists; the repo
page is /newos4/about/.

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