💅 Polish: Run a performance audit

[JoshuaKGoldberg]

Tooling Report Checklist

• [X] I have pulled the latest main branch of the repository.
• [X] I have searched for related issues and found none that matched my request.
• [X] This is the appropriate issue form for the tooling issue I would like to report.

Expected

The site performance is pretty good as-is. But, it can be better.

Actual

At least the Google Font embed is too much data. And I should check whether that font (and any other resources) should be loaded from the learningtypescript.com domain.

Additional Info

Marking as blocked similar to #15.

[JoshuaKGoldberg]

Nice.

I'll just fix the one last // TODO: Reduce these to just the weights I actually need: referring to the Google Fonts family include.