Now that we are using gitea the contents of our README.rst are
more prominently displayed. Starting it with a "Team and repository
tags" title is a bit confusing. This change makes it start with the
name of the project instead.
While at it, also fix the intro and the CONTRIBUTING.rst mention,
This change renames everything to Neutron while providing backwards
compatible adjustments for Grizzly configuration files.
implements blueprint: remove-use-of-quantum