Documentation: Update WA3 Documentation

Update the documentation and build system for producing documentation for
WA3 with support for automatic building on readthedocs.

Note: This is currently a WIP.

doc/source/run_config/Meta_Configuration.rst

@@ -0,0 +1,54 @@
+user_directory:  
+    type: ``'str'``
+
+    Path to the user directory. This is the location WA will look for
+    user configuration, additional plugins and plugin dependencies.
+
+    default: ``'~/.workload_automation'``
+
+assets_repository:  
+    type: ``'str'``
+
+    The local mount point for the filer hosting WA assets.
+
+logging:  
+    type: ``'LoggingConfig'``
+
+    WA logging configuration. This should be a dict with a subset
+    of the following keys::
+
+        :normal_format: Logging format used for console output
+        :verbose_format: Logging format used for verbose console output
+        :file_format: Logging format used for run.log
+        :color: If ``True`` (the default), console logging output will
+                contain bash color escape codes. Set this to ``False`` if
+                console output will be piped somewhere that does not know
+                how to handle those.
+
+    default: ::
+
+        {
+            color: True,
+            verbose_format: %(asctime)s %(levelname)-8s %(name)s: %(message)s,
+            regular_format: %(levelname)-8s %(message)s,
+            file_format: %(asctime)s %(levelname)-8s %(name)s: %(message)s
+        }
+
+verbosity:  
+    type: ``'integer'``
+
+    Verbosity of console output.
+
+default_output_directory:  
+    type: ``'str'``
+
+    The default output directory that will be created if not
+    specified when invoking a run.
+
+    default: ``'wa_output'``
+
+extra_plugin_paths:  
+    type: ``'list_of_strs'``
+
+    A list of additional paths to scan for plugins.
+