Add more boilerplate to main announcement

TODO: add all this to galaxy-release-util script

doc/source/releases/24.0_announce.rst

@@ -1,12 +1,61 @@
 
-:orphan:
-
 ===========================================================
 24.0 Galaxy Release (March 2024)
 ===========================================================
 
+.. include:: _header.rst
 
-Schedule
+Highlights
 ===========================================================
- * Planned Freeze Date: 2024-02-26
- * Planned Release Date: 2024-03-25
+
+Feature1
+--------
+
+Feature description.
+
+Feature2
+--------
+
+Feature description.
+
+Feature3
+--------
+
+Feature description.
+
+Are you an admin? See the Administration Notes below, and check out `some admin relevant PRs <https://github.com/galaxyproject/galaxy/pulls?q=label%3Ahighlight%2Fadmin+milestone%3A24.0+is%3Aclosed+is%3Apr>`__.
+
+Get Galaxy
+===========================================================
+
+The code lives at `GitHub <https://github.com/galaxyproject/galaxy>`__ and you should have `Git <https://git-scm.com/>`__ to obtain it.
+
+To get a new Galaxy repository run:
+  .. code-block:: shell
+
+      $ git clone -b release_24.0 https://github.com/galaxyproject/galaxy.git
+
+To update an existing Galaxy repository run:
+  .. code-block:: shell
+
+      $ git fetch origin && git checkout release_24.0 && git pull --ff-only origin release_24.0
+
+See the `community hub <https://galaxyproject.org/develop/source-code/>`__ for additional details on source code locations.
+
+Administration Notes
+===========================================================
+
+[TODO: add items or drop section if none]
+
+Configuration Changes
+===========================================================
+
+[TODO: add items or drop section if none]
+
+Release Notes
+===========================================================
+
+.. include:: 24.0.rst
+   :start-after: announce_start
+
+.. include:: _thanks.rst