feat(docs): redesign landing page with richer content and new screenshots

[saiteja-bellam-1]

Summary

• Full rewrite of docs/index.html — replaces the minimal single-section page with a rich, multi-section landing page built around the freelance/consultant ICP
• Adds Geist + JetBrains Mono typography via Google Fonts
• New sections: Freelancer Math (interactive savings calculator), Who This Is For (persona cards), Compare table (CloudTunnels vs raw CLI vs other tunnel managers), Social Proof slot
• Provider cards updated with real app screenshots (gcp.png, aws.png, sql.png, ssh.png)
• Improved Install section with a terminal emulator showing ctun usage
• Scroll-reveal animations, copy-to-clipboard buttons, accessible focus styles
• Adds docs/logo.png for nav/footer branding

Test plan

• Open docs/index.html locally in a browser and verify all sections render correctly
• Check responsive layout at ≤760px (nav links collapse, hero stacks, grids reflow)
• Verify copy buttons work for the install command
• Verify the savings calculator updates the animated number on slider input
• Confirm screenshots load (gcp/aws/sql/ssh.png paths are relative to docs/)
• Check that the GitHub Pages deployment renders the new page at the live URL

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