Icons are hidden on mobile

Icons in the `navbar-end` (social, rss, ical) are hidden on mobile.
`navbar-end` has the `is-hidden-touch` class, probably because it doesn't look good as-is:

<img width="320" alt="Image" src="https://github.com/user-attachments/assets/19c3e897-8a46-4d2c-b4fe-774b3b037299" />

Perhaps add mobile-only text next to the icons?