Documented the Doxy executable target and source code.

App/Catalogs/Doxy.docc/DoxyApp.md

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+# ``DoxyApp``
+
+A command-line tool that starts the **Doxy** service in the local machine, based on the configuration provided by a 
+list of input parameters. 
+
+## Overview
+
+The service, in a nutshell, proxies the contents of each and every available `DocC` archive at a specific folder in the 
+local file system so they can be rendered by any web browser installed in the machine. Furthermore, it is also possible 
+to query the list of the available `DocC` archives that are found at the *archives* folder in the local file system.
+
+The implementation that builds the service in this executable is provided by the `DoxyLibrary` target, that could be 
+tested in total isolation. This is a standard pattern for [building command-line tools](https://www.swiftbysundell.com/articles/building-a-command-line-tool-using-the-swift-package-manager/) 
+with the [Swift programming language](https://www.swift.org).   
+
+## Topics
+
+### Executable
+
+- ``Doxy``
+
+### Input parameters
+
+- ``Doxy/Options``

App/Catalogs/Doxy.docc/Extensions/Doxy.md

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+# ``Doxy``
+
+## Topics
+
+### Input parameters
+
+- ``Doxy/Options``

App/Catalogs/DoxyApp.docc/DoxyApp.md

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-# ``DoxyApp``
-
-<!--@START_MENU_TOKEN@-->Summary<!--@END_MENU_TOKEN@-->
-
-## Overview
-
-<!--@START_MENU_TOKEN@-->Text<!--@END_MENU_TOKEN@-->
-
-## Topics
-
-### <!--@START_MENU_TOKEN@-->Group<!--@END_MENU_TOKEN@-->
-
-- <!--@START_MENU_TOKEN@-->``Symbol``<!--@END_MENU_TOKEN@-->