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/LoadingStates.tsx

@@ -0,0 +1,60 @@
+export function LoadingSpinner({ size = 'md' }: { size?: 'sm' | 'md' | 'lg' }) {
+  const sizeClasses = {
+    sm: 'w-4 h-4 border-2',
+    md: 'w-8 h-8 border-3',
+    lg: 'w-12 h-12 border-4',
+  }
+
+  return (
+    <div
+      className={`${sizeClasses[size]} border-blue-600 border-t-transparent rounded-full animate-spin`}
+      role="status"
+      aria-label="Loading"
+    />
+  )
+}
+
+export function LoadingOverlay({ message = 'Loading...' }: { message?: string }) {
+  return (
+    <div className="fixed inset-0 bg-slate-900/50 backdrop-blur-sm flex items-center justify-center z-50">
+      <div className="bg-slate-800 rounded-lg p-6 flex flex-col items-center gap-4 shadow-xl">
+        <LoadingSpinner size="lg" />
+        <p className="text-slate-300">{message}</p>
+      </div>
+    </div>
+  )
+}
+
+export function LoadingCard() {
+  return (
+    <div className="bg-slate-800 rounded-lg p-6 animate-pulse">
+      <div className="h-6 bg-slate-700 rounded w-1/3 mb-4"></div>
+      <div className="space-y-3">
+        <div className="h-4 bg-slate-700 rounded w-full"></div>
+        <div className="h-4 bg-slate-700 rounded w-5/6"></div>
+        <div className="h-4 bg-slate-700 rounded w-4/6"></div>
+      </div>
+    </div>
+  )
+}
+
+export function EmptyState({
+  icon = '📦',
+  title,
+  description,
+  action,
+}: {
+  icon?: string
+  title: string
+  description: string
+  action?: React.ReactNode
+}) {
+  return (
+    <div className="flex flex-col items-center justify-center py-12 px-4 text-center">
+      <div className="text-6xl mb-4">{icon}</div>
+      <h3 className="text-xl font-semibold text-slate-200 mb-2">{title}</h3>
+      <p className="text-slate-400 mb-6 max-w-md">{description}</p>
+      {action}
+    </div>
+  )
+}