Tracking issue: Stylo v0.2.0 release

[nicoburns]

Tracks the initial 0.2 release of Stylo on crates.io.

Depends on

• Remove dependency on webrender_api #92
• Remove Servo-specific code from malloc_size_of #91
• Don't use a cross-crate include!() macro for counter style atoms (Duplicate predefined counter styles (allows atoms crate to be published) #99)
• Rename crates from style to stylo (https://bugzilla.mozilla.org/show_bug.cgi?id=1938783)
  • Crates that are upstream (style and style_traits)
  • Crates that are not upstream (atoms, dom, style_config, style_static_prefs)
• Add README.md to stylo crate (this is what will appear on the crates.io listing).
• Update Cargo.toml metadata for release. Ensure that all crates have up-to-date listings for the following keys (version, authors, documentation, description, repository, license, edition, publish)
• Bump version numbers for release

Optional tasks

• Re-export crates from style crate to make it easier to depend on
• Upgrade crates to 2021 edition
• Improve lib.rs documentation for stylo crate
• Publish malloc_size_of on crates.io (bugzilla.mozilla.org#1933341)
• Upstream remaining diff