Twenty Nineteen: Remove Baskerville Old Face from the font stack

[kjellr]

As per discussion on GitHub:

​https://github.com/WordPress/twentynineteen/issues/737

Baskerville Old Face:

• Is difficult to read due to its mix of thin and thick strokes
• Has poor language/extended character support
• Does not reliably have other weights/styles (bold, italic, etc), so needs to rely on browser approximations of those variants.

The next fonts down the stack (Garamond and Times) are more properly aligned to the appearance of the top-level serif font in the stack (Hoefler Text), and work better in its place.

Baskerville Old Face:

Garamond (Will replace Baskerville Old Face):

Times New Roman (Fallback):

[juliemarteau]

When the patch will be included in the theme? Can it be included in the next WordPress 5.2 release?
I've got some feedbacks from my website's visitors that the text is hard to read. I think it's a much needed fix.

[SergeyBiryukov]

In 45919:

Twenty Nineteen: Remove Baskerville Old Face from the font stack due to several shortcomings:

• Being difficult to read due to its mix of thin and thick strokes.
• Having poor language/extended character support.
• Not having other weights/styles (bold, italic, etc) and relying on browser approximations of those variants.

The next fonts down the stack (Garamond and Times) are more properly aligned to the appearance of the top-level serif font in the stack (Hoefler Text), and work better in its place.

Props kjellr, Rarst, justintadlock.
Fixes #45881.