Remove globalsign verification tag from homepage.

The verification process has been completed, so this is no longer
needed.

This reverts commit a0b3b4cabadc5aa5e9f07ada1e7c9f749f2c084b.
Merge pull request #451 from alphagov/remove_globalsign_verification

Remove globalsign verification tag from homepage.
Bump govuk_template to latest version

To get the new visited link colour
Update the icon redirects to new sizes

The new sizes are being hit far more in production (by more than 16x) than the
old ones. The old ones also no longer exist in the new version of the
govuk_template..
Update comment in multi-step css

- Smart Answers now has some application specific css in addition to those found in static

https://www.agileplannerapp.com/boards/105200/cards/5836
Merge pull request #453 from alphagov/bump-template

Bump govuk_template to latest version
Merge pull request #455 from alphagov/multi-step-css-comment

Update comment in multi-step css