Make the logo smaller [#3377744]

Problem/Motivation

The logo is taking too much space.

Proposed resolution

Adjust its size based on the latest design updates on the prototype https://www.figma.com/file/fn52micITi1fCNtU0fWcPC/Prototype?type=design&...

It might be also good to handle here the top spacing of the sidebar itself so the logo isn't so close to the borders of the browser. To take into account here that we might want to give the option to show or hide the logo as a setting in the future, so I'd recommend to have a top spacing regardless if the first item is the logo or not.

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3377744-logo-smaller changes, plain diff MR !37
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