feat(docs): document Ownable

[alexfertel]

Resolves #206 & Resolves #12

There are quite a few changes besides what one would expect because I fixed all the broken links in the contract's crate after adding #![deny(rustdoc::broken_intra_doc_links)].

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[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.1%. Comparing base (5eeb152) to head (3f605cc).

Additional details and impacted files

Files	Coverage Δ
contracts/src/access/control.rs	90.1% <ø> (ø)
contracts/src/access/ownable.rs	93.0% <ø> (ø)
contracts/src/token/erc20/extensions/burnable.rs	100.0% <ø> (ø)
contracts/src/token/erc721/extensions/burnable.rs	100.0% <100.0%> (ø)
...ontracts/src/token/erc721/extensions/enumerable.rs	88.2% <ø> (ø)
contracts/src/token/erc721/mod.rs	96.2% <ø> (ø)
lib/crypto/src/merkle.rs	97.9% <ø> (ø)
contracts/src/token/erc20/extensions/metadata.rs	0.0% <0.0%> (ø)
contracts/src/token/erc721/extensions/metadata.rs	0.0% <0.0%> (ø)

[bidzyyys]

I like it.

[qalisander]

Looks good!