Change config serialisation folder, cleanup unused files

package.yaml

@@ -6,9 +6,9 @@ author:              "Author name here"
 maintainer:          "example@example.com"
 copyright:           "2021 Author name here"
 
-extra-source-files:
-- README.md
-- ChangeLog.md
+# extra-source-files:
+# - README.md
+# - ChangeLog.md
 
 # Metadata used when publishing your package
 # synopsis:            A basic game loop