changed dir structure to handle second version of the book

Vanilla/templates/security/login.html.php

@@ -0,0 +1,21 @@
+<?php include dirname(path: __DIR__) . '/_header.html.php'; ?>
+
+<?php if (false): ?>
+    You need Admin rights to access this area.
+<?php else: ?>
+    <br>
+
+    <form method="POST">
+        <label for="nick">Username</label>
+        <input type="text" name="nick" id="nick">
+
+        <label for="password">Password</label>
+        <input type="password" name="password" id="password">
+
+        <!-- maybe later -->
+        <!-- <input type="hidden" name="_csrf" value="csrf_token" -->
+        <input type="submit" value="Login">
+    </form>
+<?php endif; ?>
+
+<?php include dirname(path: __DIR__) . '/_footer.html.php' ?>