Font weight adjustments
Created by: quinnkeast
There's a few spots with the wrong font weight applied:
On the extensions dropdown in the repository/code views:
The font weight is 500 while it should be 400.
On the path separators:
The font weight is 600 while it should be 400.
On the active tabs on pages like Code monitoring and on the search sidebar:
The font weight is 700 while it should be 600.
On the search snippets, which use the button style but are more visually just text links than buttons, we should prefer the 400 font weight.
