Add missing license headers

static/js/home.js

@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 if ($("#grid").length) {
     window.shuffleInstance = new window.Shuffle(document.getElementById('grid'), {
         itemSelector: '.pub__brick',

unsubscribe.php

@@ -1,5 +1,9 @@
 <?php
 
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 require __DIR__ . "/required.php";
 
 require __DIR__ . "/lib/iputils.php";

view.php

@@ -1,4 +1,7 @@
 <?php
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 $id = $_GET['id'];
 $id = filter_var($id, FILTER_SANITIZE_NUMBER_INT);