Rename (some) titles, and restructure Gemian page

shymega committed Aug 6, 2023

Add Astro troubleshooting page with Zygisk undo I was [hit by this issue today](https://discord.com/channels/798562411421499392/984151635301367818/1079111164665016421), and [stumbled across the solution on Discord](https://discord.com/channels/798562411421499392/984151635301367818/1067797447717421126). I think this'd be a good place to document these kinds of solutions. Credit: Insane AFKing

ZimbiX committed Feb 25, 2023