fix: small screen styling

[Pertempto]

What has changed

• Improved the landing page nav bar on small screens

Connected Issues

355

QA Steps

Test with any screen width >= 300px.

• The logo should be shown
• The title should be shown
• The interlinear button should be shown

Test with any screen width >= 768px

• The resources link should be shown
• The volunteer link should be shown
• The go deeper link should be shown

Post-Deployment

• [x] Nothing required