Add electrical wiring diagram for Voron 0.1 and SKR mini E3 V3.0

[GadgetAngel]

*updated Electrical Index.md file to add the Voron 0.1 SKR mini E3 V3.0. *added initial preparation diagram *added description for wiring diagram *added wiring diagram for Voron 0.1 *added URL to the Klipper Configuration from VoronDesign/Voron-0 GitHub Repo, Voron0.1 branch for SKR mini E3 V3.0 *added Color Pin diagram for Bigtreetech SKR mini E3 V3.0 *added original SKR mini E3 V3.0 pinout *added URL to the original Bigtreetech Github Repo on the SKR mini E3 V3.0 board