New pkgdown issues

[jeroen]

A few test pages:

• https://docs.ropensci.org/magick/ (search box is gone?)
• https://docs.ropensci.org/jagstargets/
• https://docs.ropensci.org/dynamite/articles/dynamite_priors.html (math seems ok??)
• https://docs.ropensci.org/unrtf/ (looks ok?)
• https://docs.ropensci.org/mctq/ (no search box, alignment of navbar seems weird?)

Also there is an issue with the favicons. In the previous version we used common favicons on docs.ropensci.org e.g.

• https://docs.ropensci.org/apple-touch-icon.png
• https://docs.ropensci.org/favicon-32x32.png

And so on. However the new page has favicons in the pkgdown site, but those are missing:

Writing to: /tmp/Rtmpror1TN/unrtf
── Sitrep ──────────────────────────────────────────────────────────────────────
✔ URLs ok.
✖ Favicons not ok.
  Package logo is newer than favicons.
  Do you need to rerun `build_favicons()`?
✔ Open graph metadata ok.
✔ Articles metadata ok.
✔ Reference metadata ok.