- replace old Docker desktop screenshot with the new sidebar
- Remove all references to Yarn in the explanation for Part 1
- Show new project directory structure for getting-started-repo
- Remove PWD reference from Part 3
- Remove all occurances of Yarn in Part 7 and 8
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## Description
<!-- Tell us what you did and why -->
## Related issues or tickets
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## Reviews
This PR is heavily dependent upon
https://github.com/docker/getting-started-app/pull/98
<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->
- [ ] Technical review
- [ ] Editorial review
- [ ] Product review
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Co-authored-by: Craig Osterhout <craig.osterhout@docker.com>