Shift default config to own file

.env.development

@@ -0,0 +1,14 @@
+##
+# DEVELOPMENT: Default
+#
+# We're using this to set variables for our local development.
+# Please feel free to delete or modify this file for your own setup.
+# Be careful not to commit anything sensitive to source control.
+#
+
+PUBLIC_URL=/
+
+#
+# Most vars require REACT_APP_* naming
+#
+REACT_APP_CONFIG=config/default.js