Last deployment fixes

Skip LaTeX tests, commit migrations, remove some fixtures

ansible/roles/7-postinstall/tasks/main.yml

 ---
-- name: Make Django migrations
-  command: /var/www/note_kfet/env/bin/python manage.py makemigrations
-  args:
-    chdir: /var/www/note_kfet
-  become_user: www-data
-
 - name: Migrate Django database
   command: /var/www/note_kfet/env/bin/python manage.py migrate
   args: