Implement layout and device list page

client/layout.js

@@ -0,0 +1,19 @@
+"use strict";
+
+import m from "mithril";
+
+import menu from "./menu";
+
+const layout = {
+  view: vnode => {
+    return [
+      m("#header", [
+        m("img.logo", { src: "logo.svg" }),
+        m(menu, { page: vnode.attrs.page })
+      ]),
+      m("#content", [vnode.children])
+    ];
+  }
+};
+
+export default layout;