Docs visual overhaul
- Banner artwork on every card, plus a lifecycle illustration on the introduction.
- New diagrams: bid lifecycle and access modes.
- Refreshed theme and content across all guides.
Docs refresh
- Repositioned Ornn as a GPU omnicloud across the docs.
- Documented the full bid lifecycle: Pending deposit → Active → Accepted → Reservation created, plus Rejected, Withdrawn, and Expired.
- Clarified that checkout / down-payment happens before a bid is reviewable.
- Updated Account to reflect four tabs: Profile, Billing, Settings, and SSH keys.
- Added an Access guide with SSH config, port forwarding, data persistence, and troubleshooting.
- Added Manage SSH keys and Resale market guides.
- Added the Ornn Compute CLI reference.