Update usage example

Usage example in readme and doc show an input of name. A plan will show the following error when the input name is used. Could the usage examples be updated from name to safran_resource_name.

│ Error: Missing required argument │ │ on main.tf line 4, in module "frontend_security_group": │ 4: module "frontend_security_group" { │ │ The argument "safran_resource_name" is required, but no definition was │ found. ╵ ╷ │ Error: Unsupported argument │ │ on main.tf line 16, in module "frontend_security_group": │ 16: name = "test-frontend" │ │ An argument named "name" is not expected here.