Guides ESTIM + VAM

- Added Advanced section with a few things for experienced electronauts (electronuts?) to try!
- Updated images to reflect the latest Restim Version changes (as of Aug 02, 2025)
- Clarified a few sections and removed the notes from update 2 that required backtracking

- Correction about Yoooi Toy Serial Controller
- Note about external software updates

I got it to work! I don't know why I hadn't tried getting it to work earlier but I took a second look at it and figured it out. Check the guide for the details!