Improve Assembler typography styles

[richtabor]

A few improvements I discovered as I research what folks are doing with the Assembler theme.

Changes proposed in this Pull Request:

• Closes Assembler: Move the style variation specific font families from the main theme.json to the variation json file. #8079
• Adjust size of default H4 to add more visual hierarchy.
• Disable background color picker on heading blocks.
• Reduce size of xx-large just a little.
• Remove "Rufina" variation; it's not strong and too similar to others.
• Add tweaks for site tagline in typography styles.
• Encompasses Assembler: Move the style variation specific font families from the main theme.json to the variation json file #8416 into this PR to prevent conflicts.

Site tagline

CleanShot.2024-11-15.at.16.40.47.mp4

H4 Before

H4 After

• props to @alaczek.

[github-actions]

Preview changes

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[github-actions]

Theme-Check results

assembler: No changes required ✅.

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[github-actions]

Theme-Check results

assembler: No changes required ✅.

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[alaczek]

This is looking good to me, but we should also address these two things:

• in the 05-fahkwang.json the headings are supposed to use 200 font weight, but we only register 400 and 600.
• in 01-figtree.json the headings are supposed to use 900 font weight, but we only register 400-700.

We either need to add the missing font weights or update the headings definition.

There are also unused fonts - Libre Baskerville, and Rufina.