Documentation updates (#882)

Restructured the docs folder in preparation for more docs. Improved the contents a bit.

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+# Zen Storage Server Versioning
+
+Any API changes made in the Zen Storage Server must be backwards compatible. That is to say, a newer 
+version of the server must be compatible with older versions of client code (typically, the Unreal Engine
+editor or runtime). This means you can use any newer version of the server with some version of the engine.
+For example, using Zen Server 5.5.0 with an engine version of 5.4.3 would be perfectly valid and in some
+cases this may be desirable to get improvements in performance or functionality from newer versions of
+the server without upgrading the engine.
+
+Newer clients may not be backwards compatible however, which means that you will generally not be able to 
+use an older server version with more recent UE versions.
+
+The server is versioned such that you can easily correlate the server version with the engine version. Thus
+in the Unreal Engine v5.4.0 release the server will be tagged with 5.4.0 which indicates that it is 
+compatible with the 5.4.0 (and earlier) runtime. As updates are made, new versions may be released and these
+will have a higher minor version number (5.4.1, 5.4.2 etc) but these will not necessarily line up with point
+releases of the engine since there may be more or fewer updates to the server than to the engine.