Include supported-by-posit script (#7740)

Author: jeroenjanssens

_pkgdown.yml

@@ -5,6 +5,7 @@ template:
   bootstrap: 5
   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="dplyr.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"
@@ -150,7 +151,7 @@ reference:
 
 articles:
 - title: Get started
-  navbar: ~
+  navbar:
   contents:
   - dplyr
   - grouping