Refactor email system and add contact form backend

Refactored email sending to use a single HTML template with a base layout, removed plain text email templates, and updated all related backend logic. Introduced a new ContactMe model, serializer, Celery task, and API endpoints for handling contact form submissions, including email notifications. Renamed ShopConfiguration to SiteConfiguration throughout the backend for consistency. Updated frontend to remove unused components, add a new Services section, and adjust navigation and contact form integration.

frontend/src/App.tsx

@@ -7,7 +7,6 @@ import PrivateRoute from "./routes/PrivateRoute";
 
 // Pages
 import PortfolioPage from "./pages/portfolio/PortfolioPage";
-import HostingSecurityPage from "./pages/hosting/HostingSecurityPage";
 import ContactPage from "./pages/contact/ContactPage";
 import ScrollToTop from "./components/common/ScrollToTop";
 
@@ -21,7 +20,6 @@ export default function App() {
           <Route path="/" element={<HomeLayout />}>
             <Route index element={<Home />} />
             <Route path="portfolio" element={<PortfolioPage />} />
-            <Route path="hosting-security" element={<HostingSecurityPage />} />
             <Route path="contact" element={<ContactPage />} />
 
             {/* Utilities */}