Allow specifying docs.rs as default for crate searches

[seritools]

I've noticed that I use !!crate about 95% of the time, so it would be awesome if there was a setting to go to docs.rs by default when selecting a crate from the dropdown, and resort to !! for crates.io.

[Folyd]

Nice suggestion, thanks. Actually, as the author, I feel the same as you. 🤣

[Folyd]

Hey, v1.1.0 has been released. Now the docs.rs is the default crate search. 🎉

[seritools]

Very nice, thanks a lot!