Drop e2xgrader is not a lab extension yet, removing it

roles/ewatercycle/templates/environment.yml.j2

@@ -21,7 +21,6 @@ dependencies:
       # TODO Once available uncomment the following line
       # - git+https://github.com/eWaterCycle/ewatercycle-sfincs
       - era5cli
-      - e2xgrader
   - setuptools
   - altair_saver
   - altair

roles/grader/tasks/main.yml

@@ -15,34 +15,24 @@
     dest: /etc/jupyter/nbgrader_config.py
     mode: 0644
     content: |
-      from e2xgrader.config import configure_exchange
       c = get_config()
       c.Exchange.root = '{{ exchange_root }}'
-      configure_exchange(c)
 - name: Grader jupyter dir
   file:
     path: /home/{{ grader_user }}/.jupyter
     state: directory
     owner: '{{ grader_user }}'
     mode: '0755'
-- name: Activate student e2xgrader mode globally
-  # TODO get conda bin path from somewhere
-  command: /opt/conda/envs/ewatercycle2/bin/e2xgrader activate student --sys-prefix
-- name: Activate teacher e2xgrader mode for grader_user
-  command: /opt/conda/envs/ewatercycle2/bin/e2xgrader activate teacher --user
-  become: true
-  become_user: "{{ grader_user }}" 
+
 - name: nbgrader config for grader user
   copy:
     dest: /home/{{ grader_user }}/.jupyter/nbgrader_config.py
     mode: 0644
     owner: '{{ grader_user }}'
     content: |
-      from e2xgrader.config import configure_base
       c = get_config()
       c.CourseDirectory.course_id = '{{ course_id }}'
       c.CourseDirectory.root = '/home/{{ grader_user }}/{{ course_id }}'
-      configure_base(c)
 - name: Course directory
   file:
     path: '/home/{{ grader_user }}/{{ course_id }}'