Mine Garren's OCC doc for material to improve our OCC docs

[andrew-walford-prisma]

In this doc, Garren explains in detail how OCC works. https://www.notion.so/prismaio/How-OCC-works-7e54faef816b4ed19f00f6dd1d98b5b5

We might want to bring some of this material into our docs.

This might overlap with https://github.com/prisma/docs/issues/3881