Introduce htmx in sith files

* Convert FileModerationView into ListView and add pagination with htmx
* Don't allow sas moderation in file moderation view
* Split up base.jinja and introduce base_fragment.jinja
* Improve FileModerationView performances and make it root only
* Add permissions tests for file modération

core/templates/core/user_edit.jinja

@@ -77,7 +77,7 @@
       {% set default_picture = this_picture.get_download_url()|tojson %}
       {% set delete_url = (
         url('core:file_delete', file_id=this_picture.id, popup='')
-        +"?next=" + profile.get_absolute_url()
+        + "?next=" + url('core:user_edit', user_id=profile.id)
       )|tojson %}
     {%- else -%}
       {% set default_picture = static('core/img/unknown.jpg')|tojson %}