Various Updates and Fixes

[ArcTrooper210]

• Added changes made to atm9/faq.md and alltheteams.md by Billy
• Added infusion setups to atm9/apotheosis.md for "Infused Teleportation Cores" from zoe and KJM
• Fixed Gravitas2 pages and nav
• Downsized pack logos for faster image loading for slow internet
• Added equations to mekanism.md to calculate fission reactor temp (Thank you @MikaylaFischler!)
• Edited contributing.md to make it more clear, added GitHub Desktop as an option and a notice that ATG will be migrating to pipen soon

[MikaylaFischler]

Instead of linking to the issue @ArcTrooper210 can you link here? https://github.com/MikaylaFischler/cc-mek-scada/wiki/Reactor-Temperature-Calculation

I am in the process of putting that page together, as it seemed like a better idea than linking to a closed issue