Move license and theme to footer

_config.yml

@@ -59,7 +59,8 @@ sphinx:
       launch_buttons:
         binderhub_url: http://binder.mypythia.org
         notebook_interface: jupyterlab
-      extra_navbar: |
+      extra_navbar: ""
+      extra_footer: |
         Theme by <a href="https://projectpythia.org">Project Pythia</a>.<br><br>
         All code in Pythia Cookbooks is licensed under Apache 2.0. All other non-code content is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons BY 4.0 (CC BY 4.0)</a>.<br><br>
       logo_link: https://projectpythia.org