Updating frontend to use the gem_layout

Changing some templates to use the full-width layout.
Change layout & dependancies

- Remove redundant feedback element (appeared twice on page)

- Example Page: /find-local-council
Update to resolve visual differences for frontend swap, changes resolve a border that is around the lookup element

Remove borders / padding from swap on:
"/foreign-travel-advice"
to maintain existing visuals.

to include Design System class

+ add margin to replace spacing between lookup and feedback.
eg: /find-local-council

Adjust grid to match Design System + slight margin adjustments to mimic current design

- Update "/settle-in-the-uk" flow to use Design System grid, 
- Remove redundant CSS
- Adjust Design to maintain or align.

Redundant as gem_layout_full_width replaces this.

Update to remove redundant classes and tags