installation: PyPI packages in kickstart scripts
- The example installation procedures now use Invenio PyPI packages instead of GitHub bleeding-edge versions. (In other words, `scripts/create-instance.sh does not use --devel` argument by default anymore.)
- Increases minimal versions of required Invenio PyPI packages to the latest recommended versions.
Signed-off-by: Tibor Simko <tibor.simko@cern.ch>