Red Hat font differences in demo

[marionnegp]

@bennypowers, this is about the following edits I sent for the color context PR:

600 weight looks bolder in the demo than on patternflyelements.org.

large buttons look like they’re bolder and a slightly larger font size.

You mentioned that this is likely due to differences in the versions of red-hat-font that are loaded. I think that the demo and prod should have the same version.