fix: run preview-docs only when md/qmd changes (axolotl-ai-cloud#2606)

* fix: run preview-docs only when md/qmd changes

* feat: add quarto yaml based on PR feedback

Author: NanoCode012

.github/workflows/preview-docs.yml

@@ -4,6 +4,12 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
 
+    # Run the workflow only when one of these files changes
+    paths:
+      - '**/*.md'      # any Markdown file
+      - '**/*.qmd'     # any Quarto file
+      - '_quarto.yaml'
+
 permissions:
   checks: write
   contents: write