Add FAQ entries from HN launch thread, move FAQ to bottom of nav

[okdistribute]

What

• Moves FAQ out of the About group to the last top-level item in the nav (file stays at about/faq.mdx so the /about/faq URL keeps working).
• Adds 9 new FAQ entries mined from the iroh 1.0 Hacker News thread, using rklaehn's and dignifiedquire's comments as the canonical answers.

New entries (ranked by relevance)

1. What problem does iroh solve?
2. How does iroh compare to Tailscale? (asked 5+ times in the thread)
3. Is iroh a replacement for IP addresses?
4. How is iroh different from other peer-to-peer networks?
5. Will iroh support WebRTC, BLE, LoRa, or another transport?
6. What languages can I use iroh from? Is there a Go version?
7. What are the risks of running a public relay?
8. Does using the Mainline DHT mean BitTorrent clients respond to iroh lookups?
9. Can iroh help route around internet segmentation or censorship?

Placed thematically (positioning Qs up top, comparisons in the comparison block) rather than as a ranked dump.

Skipped (with reasons)

• Pricing / how is iroh funded? — already covered by the existing "How is iroh development funded?" entry.
• IETF reception / flat-addressing scalability — folded into the "different from other P2P networks" answer to avoid near-duplicates.
• "Isn't this glorified P2P DNS?" — dignifiedquire's reply was a one-line quip, nothing substantive to quote.

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