Add admin mode

templates/login.html

@@ -0,0 +1,16 @@
+{% extends "base.html" %}
+
+{% block title %}Conference archive{% endblock %}
+
+  {% block content %}
+  <h1>Conference archive</h1>
+
+  <div>Admin login.</div>
+
+  <form method="POST">
+    <label for="password">Password:</label>
+    <input type="password" id="password" name="password"/>
+    <button>login</button>
+  </form>
+
+{% endblock %}