kontent, Python/Django based weblog/CMS software
kontent CMS needs the PostgreSQL database:
apt install postgresql
If you're new to PostgreSQL and are for example running Ubuntu, check this PostgreSQL howto.
To run the pip install, first some debian/ubuntu packages are needed:
apt install libpq-dev libjpeg-dev python-dev
These are needed for the PostgreSQL library and Pillow (imaging). pg_config is in postgresql-devel (libpq-dev in Debian/Ubuntu)
The default kontent install uses the excellent and minimalistic Skeleton theme/framework.