Update gen.yml

Author: haeussma

.github/workflows/gen.yml

@@ -60,4 +60,5 @@ jobs:
           key: ${{ github.ref }}
       - run: pip install mkdocs-material jupyter nbconvert mkdocs-jupyter mkdocs-plugin-inline-svg
       - run: mkdocs build
+      - run: echo 'enzymeml.org' > site/CNAME
       - run: mkdocs gh-deploy --force