Deletes a signer by ID.

{
  "data": "Signer deleted successfully",
  "message": "Signer deleted successfully",
  "success": true
}

{
  "data": null,
  "message": "Bad Request",
  "success": false
}

{
  "data": null,
  "message": "Unauthorized",
  "success": false
}

{
  "data": null,
  "message": "Signer not found",
  "success": false
}

{
  "data": null,
  "message": "Internal Server Error",
  "success": false
}