🐛 Bug: Slight horizontal mis-alignment on mobile for hero section

[JoshuaKGoldberg]

Bug Report Checklist

• [X] I have tried restarting my IDE and the issue persists.
• [X] I have pulled the latest main branch of the repository.
• [X] I have searched for related issues and found none that matched my issue.

Expected

The homepage "Hi! I'm Josh" should be aligned with the header and footer.

Actual

It's 0.5 rem too far to the right on mobile.

Additional Info

Introduced in #254.