move assets to server package

server/assets/pages/login.tmpl

@@ -0,0 +1,12 @@
+{{ define "content" }}
+<div class="padded box">
+    <div class="box-title">
+        <i class="mdi mdi-login-variant"></i> login
+    </div>
+    <form class="block" action="{{ path "/admin/login_do" }}" method="post">
+        <input type="text" id="username" name="username" placeholder="username">
+        <input type="password" id="password" name="password" placeholder="password">
+        <input type="submit" value="login">
+    </form>
+</div>
+{{ end }}