Fix padding and alignment for Vector 2022 in MediaWiki 1.40

Created by: nl6720

Remove left and right padding around .mw-content-container when the screen width is less than 1000px. "Small screens" need all the horizontal space they can get.

Align the header contents and language selector so that they do not extend too far and trigger horizontal scrolling.

If everything works as it should it should looks like this:

Before:

After:

/cc @lahwaacz @christian-heusel