[docs] moved into folders

docs/user/customize/docs.user.customize.md

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+---
+{
+	"_label": "Customize ERPNext"
+}
+---
+ERPNext offers many tools to customize the system.
+
+You simplify the forms by hiding features you don’t need using Disable Features and Module Setup, add Custom Fields, change form properties, like adding more options to drop-downs or hiding fields using Customize Form View and make your own Print Formats by using HTML Templates. You can also create multiple Letter Heads for your Prints.