Refactor of compiler doc group #2958
Description
Currently the Doc group in the compiler consists of bunch of code written by bunch of different people in a different ranges of time. It has became a little bit of a mess, like a parser or such shenanigans https://github.com/starkware-libs/cairo/blob/4c85c2fd38f8039fdad5653b191917570f8d79eb/crates/cairo-lang-doc/src/helpers.rs#L191.
Also maybe we should separate parser logic from the db logic? just a suggestion
AC:
- Simplify parser if it's possible.
- Think about changing the overall structure of the package to make it more readable and implement it.