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/App.tsx

@@ -0,0 +1,25 @@
+import { BrowserRouter as Router, Routes, Route, Outlet } from 'react-router-dom'
+import Layout from './components/Layout'
+import { ToastContainer } from './components/Toast'
+import Dashboard from './pages/Dashboard'
+import ProxyHosts from './pages/ProxyHosts'
+import RemoteServers from './pages/RemoteServers'
+import ImportCaddy from './pages/ImportCaddy'
+import Settings from './pages/Settings'
+
+export default function App() {
+  return (
+    <Router>
+      <Routes>
+        <Route path="/" element={<Layout><Outlet /></Layout>}>
+          <Route index element={<Dashboard />} />
+          <Route path="proxy-hosts" element={<ProxyHosts />} />
+          <Route path="remote-servers" element={<RemoteServers />} />
+          <Route path="import" element={<ImportCaddy />} />
+          <Route path="settings" element={<Settings />} />
+        </Route>
+      </Routes>
+      <ToastContainer />
+    </Router>
+  )
+}