Add a "No standard library" category
Add a "No standard library" category

Allows browsing of crates that are `#![no_std]` compatible.

rust-lang/crates.io,steveklabnik/crates.io,rust-lang/crates.io,steveklabnik/crates.io,rust-lang/crates.io,steveklabnik/crates.io,steveklabnik/crates.io,rust-lang/crates.io