Shrinks the header bar from 50px to 40px.

Decreases margin around the title, the search bar, and the logo image to
compensate. The logo no longer has a red background, but the picture of the
face increases size slightly, as it's able to be bigger without a background
circle.

Old header:

<img src="https://api.monosnap.com/image/download?id=xrAv4vnJkeLnKK6C6pqf6vceBOB8ZK" />

New header:

<img src="https://api.monosnap.com/image/download?id=OD1YYDxcvKEEEHiHyL0gdhZkRO6VFb" />