Add first implementation of loading modal

app/templates/base.html.j2

@@ -158,9 +158,7 @@
     </header>
 
     <main class="grey lighten-5">
-          {% block main_block %}
-          {% endblock %}
-
+      {% block main_block %}{% endblock %}
     </main>
 
     <footer class="page-footer">
@@ -188,6 +186,10 @@
           document.getElementById("new-job"),
           {"coverTrigger": false}
         );
+        var loadingModal = document.getElementById("loading-modal");
+        console.log(loadingModal);
+        M.Modal.init(loadingModal, {"dismissible": false});
+        M.Modal.getInstance(loadingModal).open();
         var entry;
         for (entry of document.querySelectorAll("#slide-out a:not(.subheader)")) {
           if (entry.href === window.location.href) {