fix: index new educational resources

Author: oesteban

mkdocs.yml

@@ -29,6 +29,7 @@ nav:
         - Executing with Docker: apps/docker.md
         - Executing with Singularity: apps/singularity.md
       - Presentations: users/talks.md
+      - Educational: users/educational.md
     - Documentation (devs):
       - Developer Environment: devs/devenv.md
       - Versions Matrix: devs/versions.md