fix: broken file extension

Author: sim13pods

.github/workflows/docs.yaml

@@ -9,7 +9,7 @@ on:
       # Only rebuild website when docs have changed
       - 'README.md'
       - 'docs/**'
-      - 'mkdocs.yml'
+      - 'mkdocs.yaml'
       - .github/**
 
 jobs: