docs: fix wiki pages documenting nonexistent commands/flags (#89, #90, #99)
- Cloudflare-Migration.md documented a `doorman migrate` command that
doesn't exist (unbuilt "Phase 6" roadmap item per RELEASE-2.0.md).
Added a clear "not yet available" banner and a new manual-migration
workflow using commands that exist today (backup, download, hand-edit,
validate, sync), and marked the automated-workflow content as planned.
- Home.md and Cloudflare-Setup.md called Cloudflare support "stable"/
"production-ready", contradicting CLAUDE.md/AGENTS.md's "(beta)"
label. Updated both to say beta.
- Fixed several documented-but-nonexistent flags/subcommands:
`template add <name> --provider cloudflare` (no `add` subcommand or
`--provider` flag on template), `init --provider cloudflare`
(init has no --provider flag or Cloudflare support at all),
`validate --strict`/`--provider`, `diff --source/--target`
(diff doesn't do cross-provider comparison), `list --verbose`
(use --debug), `backup --name` (backups use an auto-generated
timestamped filename, controlled via --output).
docs: sync wiki for the vercel-doorman -> @gfargo/doorman rename
Install/npx examples now reference @gfargo/doorman, already-installed
binary examples (CI YAML, package.json scripts) use the doorman bin
name, and GitHub/npm links point at gfargo/doorman. Also drops the
"when Cloudflare support lands" line in Getting-Started since
Cloudflare WAF support has already shipped.
docs: add Cloudflare setup and migration guides, update sidebar