* Rework docs navigation and move alternatives to top-level pages
- Add nested docs nav with categories, collapsible groups, breadcrumbs,
and a right-hand page outline with heading slugs.
- Move alternatives out of /docs/alternatives into /alternatives/*
marketing pages with 301 redirects.
- Add github-slugger for heading IDs and require explicit width on
SiteShell so new pages can't accidentally pick the narrow prose layout.
- Remove the best-practices doc from public-docs.
* Make docs content column prose-width
- New /cloud page with signup form (email, name, company, role, message)
posting to a Discord webhook via a TanStack Start server function on
the Cloudflare Worker. Webhook URL read from DISCORD_WEBHOOK_URL secret.
- Extract SiteShell, SiteFooter, FAQItem from landing-page.
- Migrate /privacy, /download, /blog, /changelog, /cloud to SiteShell so
they share header + footer with consistent width.
- Add /cloud to header and footer nav.
- Make /docs sidebar full-width; bump footer text from xs to sm.
- Add Cloudflare Workers types and ignore .dev.vars.
