Add Trident Mellow Flyf407zg wiring diagram, This PR will not work properly without PR #256

[GadgetAngel]

*Added Trident Mellow Flyf407zg wiring diagram, This PR will not work properly without PR #256 . It contains a link to the information in PR #256

*Added Electrical Index.md file to add the Trident Mellow Flyf407zg (tri_flyf407zg_uart_wiring.md)

*reused three additional files: a. flyf407zg_additional_resources.md b. flyf407zg_RaspberryPi.md c. flyf407zg_Resources.md

*added initial Removal of Jumpers diagram *added initial preparation - Set Jumpers diagram for Mellow Flyf407zg *Added description for Trident wiring diagram in Mellow Flyf407zg *added wiring diagram for Trident - Mellow Flyf407zg *added the heatsink diagram to remind user to ensure that the heatsinks are installed on the stepper motor drivers for:

1. MCU XYE with heat sinks

*added SSR wiring diagram using Mellow Flyf407zg *added URL to the Klipper Configuration by Antage (https://gist.githubusercontent.com/antage/1976d9df8e8a1126ebbe6f3935145394/raw/6bc4c53194be75a9889fba754ffa61fbb5c7cb89/printer.ini) for Mellow Flyf407zg *Added Color Pin diagram for Mellow Flyf407zg *added original Mellow Flyf407zg pinout *added URL to the original Mellow Flyf407zg Github Repo