Include supported-by-posit script (#320)

Author: jeroenjanssens

_pkgdown.yml

@@ -9,4 +9,5 @@ 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-light-bg="#666f76" data-light-fg="#f9f9f9"></script>
       <script defer data-domain="pkgload.r-lib.org,all.tidyverse.org" src="https://plausible.io/js/plausible.js"></script>