Bug#891374: python-django-postorius: broken symlinks: /usr/share/doc/python-django-postorius/html/_static/*

[Andreas Beckmann]

Followup-For: Bug #891374

As Dmitry Shachnev mentioned in #911069:

> These symlinks are generated by dh_sphinxdoc, so better to depend on
> ${sphinxdoc:Depends}.


Andreas