Standardise radio buttons and checkboxes

• update gemifile
• add necessary js references and code
• add necessary class to the form labels

CSS styles for this can be found in static

https://www.agileplannerapp.com/boards/105200/cards/5197
Update to latest version of frontend toolkit
Remove radio button js and move to static to be shared across repos
remove gemilfe.lock conclict
Merge pull request #1085 from alphagov/standardise-radio-buttons-checkboxes

Standardise radio buttons and checkboxes