Show similar experience for both WikiGrok versions A and B.

* Both versions have the same first (welcome) and last (thanks) steps
* Make 'no-thanks' not a permanent opt-out
* Show 'tell me more' button in the last step

Change-Id: Id86375a7e9a7aba1ec3db2a37d61c76413a88b63
Merge "Show similar experience for both WikiGrok versions A and B."