docs: update to DZGUI 7 spec

docs/source/usage.rst

@@ -1,25 +1,29 @@
 Usage
 =========
-
 It is always advised to have Steam running in the background. DZGUI is meant to run "on top of" Steam.
 
 DZGUI can be launched in one of three ways.
 
 From a terminal
 ------------------
-
-Invoke the command ``./dzgui.sh`` from wherever you downloaded the DZGUI script to.
+Invoke the command ``./dzgui`` from wherever you downloaded DZGUI to.
 
 Launching from a terminal may give more verbose information in the event of a crash, and can be a good way of troubleshooting problems.
 
 From the shortcut shipped with the application
 --------------------------------------------------
+When completing the first-time setup, you will be asked if you want to create additional system shortcuts.
+If applicable for yourDesktop Environment, these shortcuts can be created.
 
-On most distributions, if you are using a desktop environment based on the Freedesktop specification, shortcuts will be installed for you.
-
-- One shortcut is located under the ``Games`` category of your system’s applications list/start menu.
-- The other is accessed via the ``DZGUI`` desktop icon (Steam Deck only)
+- One shortcut will be located under the ``Games`` category of your system’s applications list/start menu.
+- The other is accessed via the ``DZGUI`` shortcut on the desktop
 
 From Steam
 --------------
-See :doc:`steam`.
+DZGUI will also ask you if you want to add a "non-Steam game" shortcut to Steam.
+This shortcut will launch DZGUI directly and comes with integrated grid and cover artwork.
+
+You must restart Steam for this shortcut to take effect in your library.
+
+.. note::
+   You can also pass DZGUI launch parameter's to the Steam shortcut via Steam's right-click menu. See :doc:`flags`.