chore: remove toh from nav until more chapters are up, fix bad image

public/docs/ts/latest/guide/_data.json

@@ -8,9 +8,7 @@
   "gettingStarted": {
     "title": "Getting Started"
   },
-  "toh-pt1": {
-    "title": "Tour of Heroes Begins"
-  },
+
   "displaying-data": {
     "title": "Displaying Data",
     "intro": "Displaying data is job number one for any good application. In Angular, you bind data to elements in HTML templates and Angular automatically updates the UI as data changes."

public/docs/ts/latest/guide/gettingStarted.jade

@@ -450,4 +450,4 @@ include ../../../../_includes/_util-fns
     We're about to build a small application that demonstrates the great things
     we can build with Angular 2.
 
-    Join us next on the [Tour of Heroes].
+    <!--TODO  Join us next on the [Tour of Heroes]. -->