Don't pre-install broken pip

It doesn't work anyway, the result of Arch disabling it which we've
inherited. If you need to get new python modules for buildy activities,
you should use containers or homebrew+venv, both of which will get you
`pip`.

Resolves #214

mkosi.conf.d/99-packages-development.conf

@@ -27,7 +27,6 @@ Packages=base-devel
          podman
          podman-compose
          python-atspi # For selenium
-         python-pip # to manage python packages
          reuse # optional make dependency for a bunch of KDE projects
          qemu-desktop
          sassc # make dependency for breeze-gtk and kde-gtk-config