Add Trident SKR 2 wiring diagram, This PR will not work properly without PR #271

[GadgetAngel]

*Add Trident SKR 2 wiring diagram, This PR will not work properly without PR #271 . It contains a link to the information in PR #271

*updated Electrical Index.md file to add the Trident SKR 2 (tri_skr2_uart_wiring.md)

*reused two additional files: a. skr2_RaspberryPi.md b. skr2_Resources.md

*added initial Removal of Jumpers diagram *added initial preparation - Set Jumpers diagram for SKR 2 *updated description for wiring diagram in SKR 2 *added wiring diagram for Trident - SKR 2 *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
2. MCU Z with heat sinks

*Klipper Configuration from VoronDesign/VoronUsers TechnoPhreak's GitHub Repo (https://raw.githubusercontent.com/VoronDesign/VoronUsers/master/firmware_configurations/klipper/TechnoPhreak/BTT_SKR_v2/printer.cfg) for SKR 2 board *added SSR wiring diagram using SKR 2 *Updated Color Pin diagram for Bigtreetech SKR 2 *added original SKR 2 pinout *added URL to the original Bigtreetech Github Repo on the SKR 2 board