fix(readme): remove confusing call to action

Author: ashleygwilliams

README.md

@@ -22,9 +22,6 @@ at your option.
 
 ## Contribution
 
-**[See the "Contributing" section of the guide for information on
-hacking on `wasm-bindgen`!][contributing]**
-
 Unless you explicitly state otherwise, any contribution intentionally submitted
 for inclusion in this project by you, as defined in the Apache-2.0 license,
 shall be dual licensed as above, without any additional terms or conditions.