What's New modal: Add badge to the modal, update illustration and remove the intro card

[ivan-ottinger]

Related issues

• Resolves STU-431-linear-issue

Proposed Changes

• add "What's new" badge to the "What's New" modal
• remove first ("intro") card from the "What's New" modal
• update cli-illustration.svg illustration with minor position adjustment suited for the new "What's new" badge

Related design and discussion: STU-430-linear-issue#comment-a028b08b

Testing Instructions

1. Check out the PR branch and build the app with npm start.
2. In the top app menu, open the "What's New" modal by clicking on Help → What's New.
3. Review the new "What's New" badge. It should render correctly.
4. The newly-updated illustrations should look good as well.
5. The modal and its new badge should render on the opposite site when RTL locale is selected.

Please note that the "What's New" modal misaligned X button in RTL is not related to this PR. We have a separate task for that issue: STU-351-linear-issue

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[sejas]

I tested it in both LTR and RTL languages, and it works great. I see the badge changing sides, and it doesn't overlap with any background image.

LTR	RTL

[ivan-ottinger]

I tested it in both LTR and RTL, and it works great. I see the badge changing sides, and it doesn't overlap with any background image.

Thank you for your review and testing, Antonio!