Remove unused files

doc/source/lib/galaxy.util.backports.importlib.rst

@@ -1,8 +0,0 @@
-galaxy.util.backports.importlib package
-=======================================
-
-.. automodule:: galaxy.util.backports.importlib
-    :members:
-    :undoc-members:
-    :show-inheritance:
-

scripts/bootstrap_history_announce_template.rst

@@ -1,56 +0,0 @@
-===========================================================
-TODO Galaxy Release (v %s)
-===========================================================
-
-.. include:: _header.rst
-
-Highlights
-===========================================================
-
-**Feature1**
-  Feature description.
-
-**Feature2**
-  Feature description.
-
-**Feature3**
-  Feature description.
-
-`Github <https://github.com/galaxyproject/galaxy>`__
-===========================================================
-
-New
-  .. code-block:: shell
-  
-      % git clone -b master https://github.com/galaxyproject/galaxy.git
-
-Update to latest stable release
-  .. code-block:: shell
-  
-      % git checkout master && pull --ff-only origin master
-
-Update to exact version
-  .. code-block:: shell
-  
-      % git checkout v%s
-
-
-`BitBucket <https://bitbucket.org/galaxy/galaxy-dist>`__
-===========================================================
-
-Upgrade
-  .. code-block:: shell
-  
-      % hg pull
-      % hg update latest_%s
-
-
-See `our wiki <https://wiki.galaxyproject.org/Develop/SourceCode>`__ for additional details regarding the source code locations.
-
-Release Notes
-===========================================================
-
-.. include:: %s.rst
-   :start-after: enhancements
-
-.. include:: _thanks.rst