Move Saving and Loading demo to Loading category

loading/serialization/README.md

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+# Saving and Loading (Serialization)
+
+This demo showcases how to save a simple game with each serialization
+format supported by Godot:
+
+- ConfigFile
+- JSON
+
+More formats may be added in the future.
+
+For more information, see this documentation article:
+https://docs.godotengine.org/en/latest/tutorials/io/saving_games.html
+
+Language: GDScript
+
+Renderer: GLES 2
+
+## Screenshots
+
+![Screenshot](screenshots/save_load.png)