Update README.md

Author: hknokh

README.md

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 The **SFDMU GUI App** enhances the efficiency of creating and managing data migrations within Salesforce environments. This tool is a graphical interface for creating and maintaining the **export.json** configuration file used by the [**SFDX Data Move Utility (SFDMU) plugin**](https://github.com/forcedotcom/SFDX-Data-Move-Utility), facilitating the management of sObjects, fields, and organization connections to enhance accuracy and efficiency in data migration tasks.
 
-## Useful Resources
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 - **Detailed Documentation of SFDMU GUI App**: [SFDMU GUI App Reference Guide](https://help.sfdmu.com/sfdmu-gui-app).
 - **SFDMU Plugin Repository**: [SFDX Data Move Utility](https://github.com/forcedotcom/SFDX-Data-Move-Utility).