Implement layout and device list page

client/menu.js

@@ -0,0 +1,27 @@
+"use strict";
+
+import m from "mithril";
+
+const menu = {
+  view: vnode => {
+    const active = { [vnode.attrs.page]: "active" };
+
+    return m(
+      "nav",
+      m("ul", [
+        m(
+          "li",
+          { class: active["overview"] },
+          m("a", { href: "#!/overview" }, "Overview")
+        ),
+        m(
+          "li",
+          { class: active["devices"] },
+          m("a", { href: "#!/devices" }, "Devices")
+        )
+      ])
+    );
+  }
+};
+
+export default menu;