feat: create closed form page and close all student forms

src/pages/student/closed_form.rs

@@ -0,0 +1,13 @@
+use leptos::prelude::*;
+
+#[component]
+pub fn ClosedForm() -> impl IntoView {
+    view! {
+        <div class="flex flex-col items-center mx-auto mt-10">
+            <h1 class="text-2xl font-bold">"Form Closed"</h1>
+            <p class="text-lg">
+                "This form is now closed. If you believe this is an error, please contact the guidance office."
+            </p>
+        </div>
+    }
+}