docs: move remaining docs to docs' directory

[scardracs]

Description

That's a draft for moving the remaining docs to docs/

Fixes # (issue)

Verification and testing:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My code follows the style guidelines of this project (cargo fmt --all -- --check)
• My changes generate no new warnings (cargo clippy --all -- -D warnings/cargo check --all-targets)
• New and existing unit tests pass locally with my changes (cargo test --all)
• Cranky with 0 warning (cargo cranky)

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[voidvore]

add: !

[scardracs]

I decided to step out of that: I have other things I'd like to see done more than this one. Also, I'm not sure to be the best person for this kind of documentation update