Begin documenting how to build and release voltctl

Change-Id: Icbfb50fdf69e608281ee0af62b7501240c5d875c
diff --git a/howto/release/index.rst b/howto/release/index.rst
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+Release
+=======
+.. toctree::
+   :maxdepth: 2
+
+   voltctl/install
+   voltctl/release
+   voltctl/see_also