Convert the README file from reST to markdown
as the GitHub support for reST is poor and it's
more consistent with the charms to have a
README in markdown.
The CDG is being changed in the same way:
https://review.opendev.org/c/openstack/charm-deployment-guide/+/782607
Change-Id: I69584c645432615e2a637e160b1b4a82b4b6205f
Remove obsolete sections from setup.cfg
Remove python2 lines from requirements, the repo uses only python3.
Change-Id: I98f6dca7a01730a3f890d0627f818ebdc4f6add9
openstack-dev was decomissioned this night in https://review.openstack.org/621258
Update openstack-dev to openstack-discuss
Change-Id: I76c51ccf3384d537516bb2ccd4000b58c4b7737a
Closes-Bug: #1808310