Embed redesign - Part 1/n

[siddharthkp]

Part 1

Changes the color of the shell without changing the components. The goal of this PR is to move closer to the final design without making the experience worse. (n + 1 > n)

Demo: https://pr2678.build.csb.dev/embed/rohv5

Implementation detail:

Created a new VSCode theme that matches our design

Using it in embed. Had to modify a few components (2) to use the right keys

What steps did you take to test this?

• Testing embed applies new styles
• Testing sandbox remains the same

Checklist

• [NA] Documentation
• Testing
• Ready to be merged
• [NA] Added myself to contributors table

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[siddharthkp]

Superseded by #2731