fix: tup-639 move c-button font-weight bold to cms

[wesleyboar]

Overview

The .c-button font weight should be bold only on CMS.

And remove font-weight: var(--medium) because it is always overwritten.

Related

• TUP-639
• inspired by feat/tup 617: Migrate c-card fixes to core-styles #251 (comment)
• required by fix: tup-639 move c-button font-weight bold to cms Core-CMS#740
• required by fix: tup-639 move c-button font-weight bold to cms tup-ui#364

Changes

• removed font-weight medium of c-button not as a link
• removed font-weight bold of a c-button in a c-card

Testing

1. Test this change on https://www.tacc.utexas.edu/education/k-12-students/high-school-camps/gencyber/#application.
   _{See https://github.com/wesleyboar/tup-ui-migration-to-core.}
2. Verify "APPLICATION CLOSED" button is bold.
3. Verify "APPLICATION CLOSED" button has no instances of font-weight: var(--medium).

UI

c-button	c-card

[R-Tomas-Gonzalez]

Looks good to me.

• Tested on Core-CMS and TUP-UI, no side effects
• Looks like a simple change, migrated from tup-ui -> core-styles (then deleted) -> to core-cms