* Update govuk_frontend_toolkit to 4.12.0
https://github.com/alphagov/govuk_frontend_toolkit/blob/master/CHANGELOG
.md

* Bump govuk_template to 0.17.3
https://github.com/alphagov/govuk_template/blob/master/CHANGELOG.md

The footer was switched to the new grid helpers in govuk_template
0.17.1. This breaks the alignment of the text.
alphagov/govuk_template#134

* Remove side padding that now comes as standard
* Add grid row class for correct alignment

With the toolkits bump it includes updates to buttons which improve
the padding on buttons, GOV.UK already includes overrides to the previous
padding of buttons so this commit adds a note to remove this as part of
a wider review in favour of the padding now used in the toolkit