[DOCS]: Update wiki

[jimmyli97]

Is there an existing request for this change?

• [X] I have searched the existing issues

Context for documentation change

Wiki is outdated:

• Old names
• Old pages have things that have already been merged
• Missing some classes in Event Sourcing
• outdated infrastructure info

Proposed solution

I forked it, created some commits, and created patches from those commits which someone with write access can approve and apply.

Preview of all changes at my fork

Patches available here:

1. Replace all references of DiaperBase with Human Essentials (link)
2. Replace all references of PartnerBase with Partner model (link)
3. Remove outdated pages (link)
4. Remove outdated info on infrastructure (link)
5. Add info to Event Sourcing on Flipper flag, TestInventory, and CRUD services (link)
6. Update overview to include super admin and partner scope (link)
7. Move references to Partner Base in Base-Items to history section, remove outdated info (link)

Code of Conduct

• [X] I've read the Code of Conduct and understand my responsibilities as a member of the Ruby for Good community