Documentation links are outdated

[didibear]

Documentation links on crates.io and docs.rs are outdated:

• https://crates.io/crates/ncollide2d => Documentation button
• https://crates.io/crates/ncollide3d => Documentation button
• https://www.ncollide.org/rustdoc/ncollide2d => "The rustdoc documentation is available here"

Solutions

Either:

• make https://www.ncollide.org/rustdoc/ncollide available again
• or update links pointing to the documentation:
  • Cargo.toml for ncollide2d here
  • Cargo.toml for ncollide3d here
  • src/lib.rs here