Update index.rst to include a link to the pre-built binaries.

docs/index.rst

@@ -29,14 +29,23 @@ Nion Swift is open source. You can find the source code on
 
 Installation/Upgrading
 ----------------------
-To install Nion Swift, you will need to install a Python environment and then install Python packages required for Nion
+The quickest and easiest way to get Nion Swift running is to download a pre-built version that includes everything needed to run the basic application.
+
+* `Download for macOS, Linux, or Windows <https://nion.com/swift/downloads>`_.
+
+To install Nion Swift from Python source code, you will need to install a Python environment and then install Python packages required for Nion
 Swift.
 
 For specific installation details and download links, follow link below. Instructions to install additional packages to
 extend Nion Swift are also covered.
 
 * :ref:`installation`
 * :ref:`upgrading`
+
+Release Notes
+-------------
+To see a list of changes for each version of Nion Swift, follow the link below.
+
 * :ref:`release-notes`
 
 Using Nion Swift