Remove mousetrap-rails
Remove mousetrap-rails gem because:
- the gem has never been maintained for about 5 years (which prevents us to update the upstream JS while the upstream JS package is still updating)
- we do not need the JS wrapper the gem provides
- including the gem takes 268 kB, which we can save by removing the gem
Proposal
Remove mousetrap-rails gem safely as we are already relying directrly on mousetrap.