specify package.include in Cargo.toml and bump to v0.2.0
Summary:
I noticed that the `.tar.gz` generated by `cargo publish --dry-run`
contained the entire `website/` folder, among other things,
so now we leverage `package.include` in `Cargo.toml` to include
only what we need.
Bumping to v0.2.0 so we can publish this version to crates.io since
I decided to skip v0.1.0 since it had all that extra stuff.
Reviewed By: zertosh
Differential Revision: D53462593
fbshipit-source-id: fe88da988e555b8562b69f48e374b6a4496f2cc0