Link to more up-to-date FuncGodot plugin in CSG Tools

Qodot is now in maintenance mode and has been superseded by FuncGodot.

tutorials/3d/csg_tools.rst

@@ -20,7 +20,7 @@ Interior environments can be created by using inverted primitives.
           without holes.
 
           If you're looking for an easy to use level design tool for a project,
-          you may want to use `Qodot <https://github.com/QodotPlugin/Qodot>`__
+          you may want to use `FuncGodot <https://github.com/func-godot/func_godot_plugin>`__
           instead. It lets you design levels using
           `TrenchBroom <https://kristianduske.com/trenchbroom/>`__ and import
           them in Godot.