Include supported-by-posit script (#6693)

Author: jeroenjanssens

_pkgdown.yml

@@ -6,6 +6,7 @@ template:
 
   includes:
     in_header: |
+      <script src="https://cdn.jsdelivr.net/gh/posit-dev/supported-by-posit/js/badge.min.js" data-max-height="43" data-hide-below="1200" data-light-bg="#666f76" data-light-fg="#f9f9f9"></script>
       <script defer data-domain="ggplot2.tidyverse.org,all.tidyverse.org" src="https://plausible.io/js/plausible.js"></script>
       <script async src="https://widget.kapa.ai/kapa-widget.bundle.js"
       data-button-hide="true"