Jest styled components

[dewanshDT]

Changes:
added the jest-styled-components

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.

[lindapaiste]

Yesssss thank you!

@raclim We don't love this solution because it requires us to update the snapshots whenever we change the styles. Ideally we would ignore the styles and just look at the HTML. It's definitely an improvement because it gives us stable class names and ensures that these snapshots won't fail due to changes elsewhere.