chore: move landing page to docs/ for GitHub Pages

.claude/memory/MEMORY.md

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+# Memory Index
+
+## Feedback
+- [feedback_branching.md](feedback_branching.md) — Never commit directly to main; all changes go through a feature branch and PR

.claude/memory/feedback_branching.md

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+---
+name: Always use feature branches
+description: Never commit directly to main — all changes go through a feature branch and PR per CONTRIBUTING.md
+type: feedback
+---
+
+Always create a feature branch before making any changes, no matter how small. This includes chore commits like adding LICENSE files, updating .gitignore, or any other "trivial" change.
+
+**Why:** The project follows CONTRIBUTING.md strictly — nothing goes to main directly.
+
+**How to apply:**
+1. `git checkout -b <prefix>/<description>` before touching any file
+2. Commit on the branch
+3. `git push -u origin <branch>`
+4. Open a PR with `gh pr create`
+5. Never use `git push origin main` to push new commits