Redo the README intro again

Author: brson

README.md

@@ -1,13 +1,9 @@
 # The Rust Programming Language
 
-Rust is a fast systems programming language that guarantees
-memory safety and offers painless concurrency ([no data races]).
-It does not employ a garbage collector and has minimal runtime overhead.
+This is the main source code repository for [Rust]. It contains the compiler, standard library,
+and documentation.
 
-This repo contains the code for the compiler (`rustc`), as well
-as standard libraries, tools and documentation for Rust.
-
-[no data races]: http://blog.rust-lang.org/2015/04/10/Fearless-Concurrency.html
+[Rust]: https://www.rust-lang.org
 
 ## Quick Start