Publish to crates.io (if we want to)

[codesections]

If we're planning to publish Flodgatt to crates.io (as is typical for FOSS written in Rust), we should probably do so before 1.0.0 so that we can mention cargo install as an installation option. Publishing to crates.io isn't essential for a binary application – it's not like Flodgatt is a library crate that other Rust programs will have as a dependency.

On the other hand, it does have a few minor advantages: it lets developers who already have the Rust toolchain installed easily install Flodgatt with cargo install; it provides automatic hosting for the API docs in the format Rust developers are used to; and it will generally make it easier for new contributors to quickly get started. (Also, though probably less importantly, it will make sure that new versions of Rust are tested against Flodgatt, which protects us against the very unlikely eventuality of breaking changes in Rust).