Save assurance for page 25 question 1

The Assurance question was previously removed. When it was reinstated the controller was not modified to save the response. This is fixed here.
Sending from my email address as this is a registered admin.
Merge pull request #144 from alphagov/p25q1_assurance

Save assurance for page 25 question 1
Remove debugging code on page 22

Fixes [card #7925](https://www.agileplannerapp.com/boards/187120/cards/7925)
Merge pull request #147 from alphagov/remove-debugging-values

Remove debugging code on page 22
Remove 'Page 1' from the new service page

Because:
- It's not that helpful to say 'page 1' without 'of 38'
- The next page is also titled 'Page 1'

Fixes [card #7944](https://www.agileplannerapp.com/boards/187120/cards/7944)
Merge pull request #150 from alphagov/remove-page-1-supertitle

Remove 'Page 1' from the new service page
Merge branch 'master' of https://github.com/alphagov/supplier-submission-portal into page8_min_price_validation