Add user badge and logout to dashboard

web/templates/dashboard.html

@@ -17,6 +17,8 @@
         <span>{{ system.hostname }}</span>
         <span>{{ system.ip }}</span>
         <span>{{ system.time }}</span>
+        <span>user: {{ user }}</span>
+        <form method="post" action="/logout" class="logout-form"><button class="ghost">Выйти</button></form>
       </div>
     </header>