Try variable fonts as a means to reduce package size

[carolinan]

Description

Partial for #401.
By replacing the separate font files with a single variable font, the package size can be decreased somewhat, and the size of theme.json is decreased as well.

Testing Instructions

Test the typography preset that uses the updated font families:
Manrope
Fira code
Platypi
Vollkorn
Ysabeau Office

Check that any visual changes are acceptable, since there may be some minor differences in the two formats.
Conform that the correct font style settings are available in the Typography panel > Appearance

[github-actions]

Preview changes

You can preview these changes by following the link below:

• Preview changes for twentytwentyfive

I will update this comment with the latest preview links as you push more changes to this PR.

Note

The preview sites are created using WordPress Playground. You can add content, edit settings, and test the themes as you would on a real site, but please note that changes are not saved between sessions.

[github-actions]

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Co-authored-by: carolinan <[email protected]>
Co-authored-by: juanfra <[email protected]>
Co-authored-by: beafialho <[email protected]>

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[juanfra]

Thank you Carolina, from what I tested it looks good.

[beafialho]

Thank you for making this change! If my testing is showing accurately, these are looking similar to the previous ones to me. Just to confirm, do they look like the screenshots below to you as well? If so, this is ok to merge.

[juanfra]

Yes, it is looking like the screenshots to me. I'm merging this one then.

[juanfra]

Thank you all!