Update Voron2.4 SKR V1.3; This PR will not work properly without PR #231

[GadgetAngel]

Update Voron 2.4 SKR V1.3, This PR will not work properly without PR #231. It contains a link to the information in PR #231

• updated Electrical Index.md file to add the Voron 2.4 SKR V1.3 (v2_skr13_uart_wiring.md)

• Add two additional files: a. skrv13_Resources.md b. skrv13_RaspberryPi.md

• added initial Removal of Jumpers diagram

• added initial preparation - Set Jumpers diagram for SKR V1.3

• updated description for Voron 2.4 wiring diagram in SKR V1.3

• 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 in UART mode
2. MCU Z with heat sinks in UART mode

• added URL to the Klipper Configuration from VoronDesign/Voron-2 GitHub Repo for SKR V1.3 board
• added Color Pin diagram for Bigtreetech SKR V1.3
• added original SKR V1.3 pinout
• added URL to the original Bigtreetech Github Repo on the SKR V1.3 board