Add preliminary Fluid Type support

[0aveRyan]

Opts-in to Fluid Typography feature with more proportional responsive collapse of font sizes.

Making note some templates still have fixed sizes, we should explore perhaps adding one final font size to address some of the current 4rem sizes in templates.

[francgrasso]

Thanks @0aveRyan ! I've approved it only now and not earlier because WP 6.1 release date is really near.

[0aveRyan]

Hey @francgrasso,

I'm currently out-of-office but would love to touch base on this and a few other Wonder things when I return in a few weeks! Fluid typography is a progressive enhancement so even a 6.0 or lower Core install should remain as-is but 6.1 users will get a slightly-improved experience. I'd love to get Sara to refine these! I was fairly conservative with my measurement tweaks and she can certainly bring some better design thinking 🙂 Have a few other things I'd love to get your thoughts on and on your radar! I'll send you both a ping when I'm back from vacation ✌️

[francgrasso]

Sure! Let's update once you're back! Enjoy your holidays for the moment 😄😉