feat(dropdown): Add icon prop to dropdown

Added icon prop to the new dropdown,
as well as added examples on using it.
Changed over <i></i> element to now use
the icon component.

feat(dropdown): Apply dynamic classes

Re work how classes are applied to
satisfy the design specs of dropdowns.
Also adjusted styling in dropdown scss.

chore: update snapshots

feat(dropdown): Adjust class names to make more sense

chore: update snapshots

feat(dropdown): Align dropdowns with design system

Added styles to align dropdown with
the design system. Added a few examples
to showcase small dropdowns with icons.

feat(dropdown): Fixed spilt dropdown

Fixed styling issues with split
dropdown that were introduced as
side effects of styles for this
Merge request.

feat(dropdown): Make dropdown example text consistent

I changed dropdown example text for testing
with the design system. Changing it back to
make sure it stays consistent with examples.

refactor: Use utility mixins

Instead of hardcoding the value out
I opted to use a utility mixin.