docs: comprehensive documentation polish & CI/CD automation

Major Updates:
- Rewrote all docs in beginner-friendly 'ELI5' language
- Created docs index with user journey navigation
- Added complete getting-started guide for novice users
- Set up GitHub Container Registry (GHCR) automation
- Configured GitHub Pages deployment for documentation

Documentation:
- docs/index.md - Central navigation hub
- docs/getting-started.md - Step-by-step beginner guide
- docs/github-setup.md - CI/CD setup instructions
- README.md - Complete rewrite in accessible language
- CONTRIBUTING.md - Contributor guidelines
- Multiple comprehensive API and schema docs

CI/CD Workflows:
- .github/workflows/docker-build.yml - Multi-platform builds to GHCR
- .github/workflows/docs.yml - Automated docs deployment to Pages
- Supports main (latest), development (dev), and version tags
- Automated testing of built images
- Beautiful documentation site with dark theme

Benefits:
- Zero barrier to entry for new users
- Automated Docker builds (AMD64 + ARM64)
- Professional documentation site
- No Docker Hub account needed (uses GHCR)
- Complete CI/CD pipeline

All 7 implementation phases complete - project is production ready!

frontend/src/components/ImportBanner.tsx

@@ -0,0 +1,44 @@
+interface ImportBannerProps {
+  session: {
+    uuid: string
+    filename?: string
+    state: string
+    created_at: string
+  }
+  onReview: () => void
+  onCancel: () => void
+}
+
+export default function ImportBanner({ session, onReview, onCancel }: ImportBannerProps) {
+  return (
+    <div className="bg-blue-900/20 border border-blue-500 rounded-lg p-4 mb-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h3 className="text-lg font-semibold text-blue-400 mb-1">
+            Import Session Active
+          </h3>
+          <p className="text-sm text-gray-300">
+            {session.filename && `File: ${session.filename} • `}
+            State: <span className="font-medium">{session.state}</span>
+          </p>
+        </div>
+        <div className="flex gap-3">
+          {session.state === 'reviewing' && (
+            <button
+              onClick={onReview}
+              className="px-4 py-2 bg-blue-active hover:bg-blue-hover text-white rounded-lg font-medium transition-colors"
+            >
+              Review Changes
+            </button>
+          )}
+          <button
+            onClick={onCancel}
+            className="px-4 py-2 bg-red-900/20 hover:bg-red-900/30 text-red-400 rounded-lg font-medium transition-colors"
+          >
+            Cancel Import
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+}