Add `rustc` and `rustdoc` lints.

[ndouglas]

User Story

As an engineer, I want to enable a strict series of lints to ensure that I write idiomatic Rust.

Tasks

• [x] Enable appropriate lints from the rustc book.
• [x] Enable appropriate lints from the rustdoc book.

Acceptance Criteria

• [x] Appropriate rustc lints have been enabled.
• [x] Appropriate rustdoc lints have been enabled.