* `database/` -> `storage/`, create skeleton `storage/` crates
* add skeleton root directories
* books: add skeleton
* ci: fix labeler.yml
* fix CONTRIBUTING.md
* fix workspace Cargo.toml
* fix `storage/`
* rename helper fs fn, `cuprate_database` -> `cuprate_blockchain`
* fix Cargo.toml
* cuprate-blockchain: revert find-and-replace
Since it has to be ported to the book anyway, there's not much
reason to update this and create review diffs.
* labeler.yml: remove `A-docs` from `books/` changes
Although books are documentation,
the `A-books` label already exists for this
