Drop Azure from PlayFab branding references (#169)

Azure PlayFab has been renamed to just PlayFab. Update the README
intro/SDK line and the plugin.cfg description accordingly. The functional
`AzurePlayFab` Steam Web API identity string is intentionally left
unchanged.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Structed

README.md

@@ -13,9 +13,9 @@
 
 
 # godot-playfab - for Godot 4!
-is an [Azure PlayFab](https://playfab.com) addon for the [Godot Engine](https://godotengine.org/). While it is very early, it is supposed to be two things:
+is a [PlayFab](https://playfab.com) addon for the [Godot Engine](https://godotengine.org/). While it is very early, it is supposed to be two things:
 
-1. A GDScript-native SDK to Azure PlayFab
+1. A GDScript-native SDK to PlayFab
 2. A Godot Editor integration to administer your game
 
 > **Note:**

addons/godot-playfab/plugin.cfg

@@ -1,7 +1,7 @@
 [plugin]
 
 name="godot-playfab"
-description="Integration with Azure PlayFab - playfab.com"
+description="Integration with PlayFab - playfab.com"
 author="Johannes Ebner"
 version="1.3.1"
 script="PlayFabEditor.gd"