v0.9.3

Added

• A 36-second video of setting HelpPuff up by asking Claude Code, in the README
  and on the Getting Started page (it plays in place on the website).
• Getting Started explains the few clicks a brand-new Cloudflare account needs
  before the first deploy: the workers.dev name, R2 and connecting this machine.

Fixed

• helppuff destroy now deletes the R2 bucket of photos and files too, after
  emptying it; before, the bucket was left behind. Without --yes it asks
  first; with --yes it deletes it; --keep-data keeps it.