Remove Citations nav tab and route

The citation information is already available in the About page's
Citation section, so the separate Citations page is redundant.

frontend/src/App.js

@@ -13,7 +13,7 @@ import LeaderboardPage from "./pages/LeaderboardPage/LeaderboardPage";
 import AddModelPage from "./pages/AddModelPage/AddModelPage";
 import VoteModelPage from "./pages/VoteModelPage/VoteModelPage";
 import AboutPage from "./pages/AboutPage/AboutPage";
-import QuotePage from "./pages/QuotePage/QuotePage";
+
 import Footer from "./components/Footer/Footer";
 import getTheme from "./config/theme";
 import { useThemeMode } from "./hooks/useThemeMode";
@@ -111,7 +111,6 @@ function App() {
                     <Route path="/add-model" element={<AddModelPage />} />
                     <Route path="/vote" element={<VoteModelPage />} />
                     <Route path="/about" element={<AboutPage />} />
-                    <Route path="/quote" element={<QuotePage />} />
                   </Routes>
                 </Box>
                 <Footer />

frontend/src/components/Navigation/Navigation.js

@@ -145,7 +145,6 @@ const Navigation = ({ onToggleTheme, mode }) => {
     { path: "/add-model", label: "Submit" },
     { path: "/vote", label: "Vote" },
     { path: "/about", label: "About" },
-    { path: "/quote", label: "Citations" },
   ];
 
   return (