Modify Card component to accept header

[rebeccahum]

Description

Modify existing Card component to accept header property:

Checklist

• [x] This PR has good automated test coverage
• [x] The storybook for the component has been updated

Steps to Test

Outline the steps to test and verify the PR here.

Example:

1. Pull down PR.
2. npm run dev.
3. Open Storybook.
4. Eat cookies.
5. Verify cookies are delicious.

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