Add quarto-output-styling extension information (#1757)

Added output-styling extension details to the YAML file.

(cherry picked from commit c30d36c)

Co-authored-by: Andrew Heiss <andrewheiss@gmail.com>

Author: github-actions[bot]

docs/extensions/listings/shortcodes-and-filters.yml

@@ -478,6 +478,12 @@
   description: >
     Developer extension to work with option values.
 
+- name: output-styling
+  path: https://github.com/andrewheiss/quarto-output-styling
+  author: '[Andrew Heiss](https://github.com/andrewheiss/)'
+  description: >
+    Style computational output, errors, warnings, and messages in HTML documents.
+
 - name: panelize
   path: https://github.com/coatless-quarto/panelize
   author: '[James Joseph Balamuta](https://github.com/coatless/)'