add: improved admin functions

front/src/pages/ChannelsPage.tsx

@@ -13,6 +13,9 @@ export default function ChannelsPage({socket}: {socket: WebSocket}) {
     const [user, setUser] = useState<User>();
 
     function deleteChannel(name: string) {
+        if (!window.confirm(`Are you sure you want to delete ${name}?`)) {
+            return;
+        }
         axios
             .post(`/api/channels/${name}/delete`, { token })
             .catch((err) => {