Reorganize app pages (#73)

* Update layout and menus

* Add breadcrumbs
Add menu icons
Add ECU drop down

* Implement submenu
Update download progress

* revamped dashboard section - failing app.test.js

* Clean up

Co-authored-by: Drew Taylor <dtaylor@fiskerinc.com>

src/services/grafana.js

@@ -0,0 +1,6 @@
+const grafanaAPI = {
+    getCarsCount: async () => 500,
+    getSignalsCount: async () => 1234567890,
+};
+
+export default grafanaAPI;