Update _config.yml for lecture 09 materials

_config.yml

@@ -76,7 +76,7 @@ links:
       demo06: "• [Demo](https://data8.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https://github.com/data-8/materials-su24&urlpath=tree/materials-su24/lec/lec06/lec06.ipynb&branch=main)"
       demo07: "• [Demo](https://data8.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https://github.com/data-8/materials-su24&urlpath=tree/materials-su24/lec/lec07/lec07.ipynb&branch=main)"
       demo08: "• [Demo](https://data8.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https://github.com/data-8/materials-su24&urlpath=tree/materials-su24/lec/lec08/lec08.ipynb&branch=main)"
-      demo09: "• Demo"
+      demo09: "• [Demo](https://data8.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https://github.com/data-8/materials-su24&urlpath=tree/materials-su24/lec/lec09/lec09.ipynb&branch=main)"
       demo10: "• Demo"
       demo11: "• Demo"
       demo12: "• Demo"
@@ -116,7 +116,7 @@ links:
       slide06: "[Slides](https://docs.google.com/presentation/d/1eeGUFry5WLYaT2X_8cwaPOR4jsJr0YHGFZru4st0qC0/edit)"
       slide07: "[Slides](https://docs.google.com/presentation/d/1eOObGQxBbVfh08om20cMkcdjSVxFP857cg3ZwrvV8SE/edit?usp=sharing)"
       slide08: "[Slides](https://docs.google.com/presentation/d/16u6qrpiJ9YNzG-V6zxWPcGQPLMKI1JWOVsOvlLZ83Dc/edit)"
-      slide09: "Slides"
+      slide09: "[Slides](https://docs.google.com/presentation/d/1wHHllEsm_WfLTcfnYnoyaAB8BZ4cr0JhZBKNDWPB7rs/edit?usp=sharing)"
       slide10: "Slides"
       slide11: "Slides"
       slide12: "Slides"