Update CLI sidebar

[byrideout]

[byrideout]

Update sidebar to match Figma designs

[byrideout]

Note: dark mode colors are still up in progress!

[mbostock]

@byrideout Can you clarify a couple things in the proposed design:

1. Can we drop the rounded corners on the background highlight for the currently active page?
2. Can we align the left edge of the header & item texts? I suggest 16px (1rem) for both as currently implemented.

[byrideout]

@mbostock yes to both of these! 👍

Edited to add that updates have been made to figma!

[mbostock]

Thanks @byrideout. I still see a number of rounded corners in the Figma… I know it’s small but can you fix please? Thanks.

[cinxmo]

Completed: #341