Update pkgdown.yaml

Author: VisruthSK

.github/workflows/pkgdown.yaml

@@ -68,6 +68,6 @@ jobs:
       - name: Deploy to GitHub pages 🚀
         uses: JamesIves/github-pages-deploy-action@v4
         with:
-          clean: false
+          clean: true
           branch: gh-pages
           folder: docs