Rosdoc2

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- Fix graphviz typo in stdeb.cfg. `132 <https://github.com/ros-infrastructure/rosdoc2/pull/132>`_
- Add long_description_content_type to support publishing on PyPI. `131 <https://github.com/ros-infrastructure/rosdoc2/pull/131>`_

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- Initial released version of rosdoc2.
Previously, rosdoc2 installation required installing directly from the main branch on GitHub.
This release will be distributed by both PyPI and the ROS 2 repositories, allowing developers to
install the package as they do other ROS infrastructure packages.