feat(font-stack): add system-ui

[denkristoffer]

Purpose of PR

Chrome on Linux doesn't seem to render our medium font weight properly. This seems to be caused by issues with the browser on that plaform:

• https://bugs.launchpad.net/ubuntu/+source/fonts-ubuntu/+bug/1512111
• https://stackoverflow.com/questions/53027044/why-is-chrome-on-linux-displaying-the-wrong-font-weight
• https://stackoverflow.com/questions/22001035/font-weight-ignored-in-chrome

This is the same bug as #1322

This PR adds system-ui to our font stack to see if that helps.

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Latest commit: c817df6

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Name	Status	Preview	Updated
forma-36	✅ Ready (Inspect)	Visit Preview	Mar 9, 2023 at 11:57AM (UTC)

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	121.37 KB (-0.02% 🔽)	2.5 s (-0.02% 🔽)	53 ms (+7.49% 🔺)	2.5 s
Module	118.16 KB (-0.02% 🔽)	2.4 s (-0.02% 🔽)	62 ms (+77.88% 🔺)	2.5 s

[denkristoffer]

Doesn't seem to fix the issue :(