Create RemoteClaw landing page

[alexey-pelykh]

Summary

• Implements the full landing page as specified in Create RemoteClaw landing page #1
• Tailwind CSS v4 with @theme brand palette, self-hosted WOFF2 fonts (DM Sans + Fragment Mono), Lucide icons
• All 8 sections: Nav, Hero, Runtimes strip, Channels grid, Feature cards (6), Architecture flow diagram, Install block (npm + curl), Footer
• Dark mode only, responsive (mobile-first, sm/lg breakpoints, max 1024px), zero JS except copy-to-clipboard
• Brand assets: favicon, logo PNGs, OG image from HQ

Acceptance criteria checklist

• Astro project initialized
• GitHub Actions deploys to GitHub Pages on push to main
• CNAME file in public/ contains remoteclaw.org
• public/install.sh and public/install.ps1 placeholder files
• Tailwind CSS v4 with @theme brand palette
• Self-hosted WOFF2 fonts (DM Sans, Fragment Mono)
• Lucide icons for feature cards
• Dark mode only, no theme toggle
• Responsive: mobile-first, 3 breakpoints, max 1024px content width
• All sections per spec (Nav, Hero, Runtimes, Channels, Features, Architecture, InstallBlock, Footer)
• Component structure matches spec

Test plan

• Verify CI build passes (typecheck + build)
• Deploy preview and verify all sections render correctly
• Test copy-to-clipboard on install commands
• Verify responsive layout at mobile/tablet/desktop breakpoints
• Confirm fonts load (DM Sans for headings, Fragment Mono for body/code)
• Verify OG meta tags render correctly (share preview)

Closes #1

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