Clean up old readme content (#15202)

Fixes #15131

There's up to date documentation in the CONTRIBUTING.md

README.md

@@ -8,28 +8,3 @@ Guide to Contributing
 ---------------------
 
 Please see [CONTRIBUTING.md](CONTRIBUTING.md)
-
-A Quick Overview of How to Use this Repository
-----------------------------------------------
-
-To add your project to our build farm, fork this repository, modify the .yaml files, and give us a pull request.
-For Fuerte and older the ROS packages are maintained in the subfolder ``releases`` and ``doc``.
-For Groovy and newer the ROS packages are maintained in the subfolder named after the ROS distribution.
-Mappings for dependencies are maintained in the ``rosdep`` subfolder.
-
-To create jobs on our build farm to build Debian sourcedeb and binarydeb packages add your bloom (or git-buildpackage compatible) repository to the ``ROSDISTRO/release.yaml`` file (or ``releases/ROSDISTRO.yaml`` for Fuerte and older).
-Please keep the alphabetic order of the list.
-You can use the script ``scripts/add_release_repo.py`` to perform the insertion.
-
-To create jobs on our build farm to perform continuous integration of your repository on every commit add your source repository to the ``ROSDISTRO/source.yaml`` file (or ``releases/ROSDISTRO-devel.yaml`` for Fuerte and older).
-Please keep the alphabetic order of the list.
-You can use the script ``scripts/add_devel_repo.py`` to perform the insertion.
-
-Files and directories:
-
- - index.yaml: list of ROS distributions (Groovy and newer) with references to their release, source and doc files
- - ROSDISTRO: the release, source and doc files of the ROS distribution and their corresponding build files
- - releases: list of released resources (e.g. GBP distro files) and targets configuration (Fuerte and older)
- - rosdep: rosdep YAML files and default configuration
- - scripts: support scripts
-