feat(docs): add GitHub Pages landing page

[Pamperito74]

What

Adds docs/index.html — a self-contained landing page for SecGate, ready to serve via GitHub Pages.

• Single static HTML file, no build step, zero external assets except shields.io badges.
• Dark theme matching @stelnyx/report-theme (bg #0a0a0a, green #00cc66 accent).
• Sections: hero + copyable install command, four-artifact panel, 1,858 → 46 noise-demotion stat, Security Score sample, five-scanner table with local/network tags, "What SecGate is — and isn't" honesty section, CI snippet, FAQ, Stelnyx-line footer.
• Inline SVG star mark + favicon (data URI) — fully offline.
• Responsive, skip-link, accessible.

.gitignore fix

The repo .gitignore had a blanket *.html (intended for scan-artifact reports). Added !docs/index.html so the landing page is tracked. Scan-artifact *.html files are still ignored everywhere else.

Deploy (manual, one-time)

After merge: Settings → Pages → Build and deployment → Deploy from a branch → branch main, folder /docs.

Site URL: https://stelnyx.github.io/SecGate/

Notes

• Lives in /docs alongside existing .md docs — index.html becomes the directory index, no conflict.
• Not in package.json files[] — not published to npm.
• No deploy workflow added — a no-build static file doesn't need CI; branch deploy is one toggle.

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