Update button styling and positioning for onboarding + map screens

[sherryyx]

See figma specs

• Button text should be Circular Bold
• Button height reduced to 56px
• Button width reduced to 311px
• Progress indicators on onboarding screen are now 32px above the button

Thanks!

[DSep]

Button text should be Circular Bold ✓
Button height reduced to 56px ✓
Button width reduced to 311px ✓

Those need to be double checked.

Still to do: Progress indicators on onboarding screen are now 32px above the button.

[DSep]

Self todo: Ensure if the map "Next" button is scaling correctly on smaller devices