Improve initial inapp page (bug 1059959)

- Hide table until user clicks 'Add a product'
- Add documentation link

![screenshot 2014-09-04 14 52 57](https://cloud.githubusercontent.com/assets/119884/4154781/b8c62730-3464-11e4-971f-b33c0e0e26c7.png)
![screenshot 2014-09-04 14 53 03](https://cloud.githubusercontent.com/assets/119884/4154784/bd999dc8-3464-11e4-9f4f-9ae538f1bf6a.png)