Remove rounded corners in design system

[maxatdetroit]

Changes Proposed in this PR

• Remove rounded corners for all components by editing bootstrap variables and regenerating bootstrap css

$ ./scripts/compile_bootstrap.sh
Compiling bootstrap SASS...
Replacing REMs with EMs...
Formatting output...
src/shared/themed-bootstrap.css 361ms

Context

We currently have a mix of rounded and non-rounded corners throughout the design system with individual components (e.g. <cod-button/>) setting border radius to 0 to remove rounded corners.

Whether we use rounded corners or not will very based on the viewers opionion (there isn't a right answer), but being consistent is important to maintain some unity throughout the design system. The current detroitmi.gov site does not use rounded corners, so this PR moves to be consistent in non-rounded corners. If we decide we want to move to all rounded corners, we can do so but we'll have to go cleanup the places where individual components set border radius to 0 so we're taking the easier route for now.

Testing

View various, complex components before and after change:

Before

After