fix: try adding favicon like so

inst/pkgdown/_pkgdown.yml

@@ -5,6 +5,9 @@ template:
       <script src="https://cdn.jsdelivr.net/npm/cookieconsent@3/build/cookieconsent.min.js" data-cfasync="false"></script>
       <script src="https://ropensci.org/scripts/matomo.js"></script>
       <noscript><p><img src="https://ropensci.matomo.cloud/matomo.php?idsite=1&amp;rec=1" style="border:0;" alt="" /></p></noscript>
+      <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
+      <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
+      <link rel="apple-touch-icon" type="image/png" sizes="180x180" href="/apple-touch-icon.png">
     before_title: '<a href="https://ropensci.org"><img src="https://ropensci.org/img/icon_short_white.svg" id="hexlogo" alt="rOpenSci"></a>'
   bootstrap: 5
   bslib: