feat(kagi): add automated registration script and docs
Add Kagi-specific automated registration script and update README.
Changes:
- Move setup-kagi-aggregator.sh to kagi-news/scripts/setup.sh
- Add comprehensive Registration section to README
- Document automated vs manual setup options
- Explain registration workflow and requirements
- Update project structure to reflect new scripts
The setup script automates all 4 registration steps:
1. PDS account creation
2. .well-known file generation
3. Coves registration via XRPC
4. Service declaration creation
This makes the Kagi aggregator self-contained and ready to be
split into its own repository.
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Co-Authored-By: Claude <noreply@anthropic.com>