Closes #71 (closed)
Idea: https://matklad.github.io//2021/02/06/ARCHITECTURE.md.html
Example: https://github.com/rust-analyzer/rust-analyzer/blob/d7c99931d05e3723d878bea5dc26766791fa4e69/docs/dev/architecture.md
More prosaic example: https://caddyserver.com/docs/architecture