memberships: user page (#126)

* reworked homepage and userhandler

* minor fixes for UI
diff --git a/core/auth/memberships/index.html b/core/auth/memberships/index.html
index 03ee299..cd3cf50 100644
--- a/core/auth/memberships/index.html
+++ b/core/auth/memberships/index.html
@@ -7,7 +7,8 @@
     <link rel="stylesheet" href="/static/pico.2.0.6.min.css">
 </head>
 <body class="container">
-    <h1>Groups Managment</h1>
+    <h1>User: {{ .CurrentUser }}</h1>
+    {{ if .LoggedInUserPage }}
     <form action="/create-group" method="post">
         <label for="group-name">Group Name:</label>
         <input type="text" id="group-name" name="group-name" required>
@@ -15,6 +16,7 @@
         <input type="text" id="description" name="description">
         <button type="submit">Create Group</button>
     </form>
+    {{ end }}
     <h4>Owner</h4>
     <table>
         <tr>