Remove onboarding screen

For now just create a local git repo and commit all the changes over
there, we're going to allow the user to first see the app and use it
however they want, and later connect it to a remote git repo.

This commit breaks the app, as the on-boarding screen is no longer
connected so you cannot push to a remote app.

lib/widgets/app_drawer.dart

@@ -1,8 +1,23 @@
 import 'package:flutter/material.dart';
+import 'package:journal/state_container.dart';
 
 class AppDrawer extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
+    Widget setupGitButton = new Container();
+    var appState = StateContainer.of(context).appState;
+
+    if (!appState.remoteGitRepoConfigured) {
+      setupGitButton = ListTile(
+        title: new Text('Setup Git Sync'),
+        onTap: () {
+          Navigator.pop(context);
+          // Update the state of the app
+          // ...
+        },
+      );
+    }
+
     return new Drawer(
       child: new ListView(
         // Important: Remove any padding from the ListView.
@@ -23,6 +38,7 @@ class AppDrawer extends StatelessWidget {
               ),
             ),
           ),
+          setupGitButton,
           new ListTile(
             title: new Text('Share App'),
             onTap: () {