UTOPIA-1535: Different size headers

[BradyMitch]

🎯 Summary

UTOPIA-1535

• Replaced header button with font size button
• Font size button toggles the popover for sizing options.
• Font size button allows for 3 header sizes and paragraph text size.

🔰 Checklist

• I have read and agree with the following checklist and am following the guidelines in our Code of Conduct document.

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation where required.
• I have tested my changes to the best of my ability.
• I have consulted with the team if introducing a new dependency.
• My changes generate no new warnings.