Refactor footer and remove unused pages

Updated the footer component and its styles for improved layout and clarity, including new contact and service sections. Removed unused pages: DonateShopPage, SkillsPage, and related CSS/JS files, and cleaned up routing in App.tsx. Also streamlined Home.module.css by merging introduction styles and removing redundant imports.

frontend/src/App.tsx

@@ -7,9 +7,7 @@ import { UserContextProvider } from "./context/UserContext";
 
 // Pages
 import PortfolioPage from "./pages/portfolio/PortfolioPage";
-import SkillsPage from "./pages/skills/SkillsPage";
 import HostingSecurityPage from "./pages/hosting/HostingSecurityPage";
-import DonateShopPage from "./pages/donate/DonateShopPage";
 import ContactPage from "./pages/contact/ContactPage";
 import ScrollToTop from "./components/common/ScrollToTop";
 
@@ -23,9 +21,7 @@ export default function App() {
           <Route path="/" element={<HomeLayout />}>
             <Route index element={<Home />} />
             <Route path="portfolio" element={<PortfolioPage />} />
-            <Route path="skills" element={<SkillsPage />} />
             <Route path="hosting-security" element={<HostingSecurityPage />} />
-            <Route path="donate" element={<DonateShopPage />} />
             <Route path="contact" element={<ContactPage />} />
 
             {/* Utilities */}