[mailman] Symlink mailman-web is included in latest version

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/mailman3/tasks/main.yml

@@ -54,12 +54,6 @@
     group: www-data
   notify: Restart mailman3-web
 
-- name: Add symlink for mailman3-web
-  file:
-    src: /usr/share/mailman3-web/manage.py
-    dest: /usr/local/bin/mailman-web
-    state: link
-
 - name: Migrate Django database
   django_manage:
     command: migrate