use crab contrib

Author: Travis Wagner

CONTRIBUTING.md

@@ -1,6 +1,6 @@
-# Contributing to Rust
+# Contributing to Crab
 
-Thank you for your interest in contributing to Rust! There are many ways to contribute
+Thank you for your interest in contributing to Crab! There are many ways to contribute
 and we appreciate all of them.
 
 The best way to get started is by asking for help in the [#new
@@ -14,15 +14,15 @@ standard library in the [Standard library developers Guide][std-dev-guide], comm
 
 ## About the [rustc-dev-guide]
 
-The [rustc-dev-guide] is meant to help document how rustc –the Rust compiler– works,
+The [rustc-dev-guide] is meant to help document how rustc –the Crab compiler– works,
 as well as to help new contributors get involved in rustc development. It is recommend
 to read and understand the [rustc-dev-guide] before making a contribution. This guide
-talks about the different bots in the Rust ecosystem, the Rust development tools,
+talks about the different bots in the Crab ecosystem, the Crab development tools,
 bootstrapping, the compiler architecture, source code representation, and more.
 
 ## [Getting help](https://rustc-dev-guide.rust-lang.org/getting-started.html#asking-questions)
 
-There are many ways you can get help when you're stuck. Rust has many platforms for this:
+There are many ways you can get help when you're stuck. Crab has many platforms for this:
 [internals], [rust-zulip], and [rust-discord]. It is recommended to ask for help on
 the [rust-zulip], but any of these platforms are a great way to seek help and even
 find a mentor! You can learn more about asking questions and getting help in the