Update GitHub Actions workflow to deploy documentation from the main branch

Author: d0rich

.github/workflows/docs.yaml

@@ -33,7 +33,7 @@ jobs:
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
-        if: github.ref == 'refs/heads/master'
+        if: github.ref == 'refs/heads/main'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./docs/dist