Add link to documentation in summary

Author: ValerianRey

.github/workflows/build-deploy-docs.yml

@@ -62,3 +62,7 @@ jobs:
           destination_dir: stable
           external_repository: TorchJD/documentation
           publish_branch: main
+
+      - name: Add documentation link to summary
+        run: |
+          echo "### 📄 [View Deployed Documentation](https://https://torchjd.github.io/documentation/${{ steps.deploy_folder.outputs.DEPLOY_DIR }})" >> $GITHUB_STEP_SUMMARY