docs: prune the list of branches
The README is way too long already. Welcoming potential users and
contributors with an overview of the project's history does not help,
IMHO.
@@ -21,9 +21,8 @@ Documentation: https://gnpy.readthedocs.io
Branches and Tagged Releases
----------------------------
-- the `master <https://github.com/Telecominfraproject/oopt-gnpy/tree/master>`_ branch contains stable, validated code. It is updated from develop on a release schedule determined by the OOPT-PSE Working Group. For more information about the validation process, see: https://github.com/Telecominfraproject/oopt-gnpy/wiki/Testing-for-Quality
+- the `master <https://github.com/Telecominfraproject/oopt-gnpy/tree/master>`_ branch contains stable, `validated code <https://github.com/Telecominfraproject/oopt-gnpy/wiki/Testing-for-Quality>`_. It is updated from develop on a release schedule determined by the OOPT-PSE Working Group.
- the `develop <https://github.com/Telecominfraproject/oopt-gnpy/tree/develop>`_ branch contains the latest code under active development, which may not be fully validated and tested.
-- the `phase-1 <https://github.com/Telecominfraproject/oopt-gnpy/tree/phase-1>`_ branch contains code for Phase I of the OOPT-PSE efforts and is kept only for reference. This branch is unmaintained.
A brief outline of major (tagged) `gnpy` releases:
