Strip the documentation index down to the essentials.

The main documentation page is now www.rust-lang.org/documentation.html

src/doc/index.md

@@ -1,39 +1,21 @@
 % Rust Documentation
 
-Welcome to the Rust documentation! You can use the section headings above
+<style>
-to jump to any particular section.
+nav {
+    display: none;
+}
+</style>
 
-# Getting Started
+This is an index of the documentation included with the Rust
+compiler. For more comprehensive documentation see [the
+website](https://www.rust-lang.org).
 
-If you haven't seen Rust at all yet, the first thing you should read is the
+[**The Rust Programming Language**](book/index.html)
-introduction to [The Rust Programming Language](book/index.html). It'll give
-you a good idea of what Rust is like.
 
-The book provides a lengthy explanation of Rust, its syntax, and its
+[**The Rust Reference**](reference.html)
-concepts. Upon completing the book, you'll be an intermediate Rust
-developer, and will have a good grasp of the fundamental ideas behind
-Rust.
 
-# Language Reference
+[**The Standard Library API Reference**](std/index.html)
 
-Rust does not have an exact specification yet, but an effort to describe as much of
+[**The Rustonomicon**](nomicon/index.html)
-the language in as much detail as possible is in [the reference](reference.html).
 
-# Standard Library Reference
+[**The Compiler Error Index**](error-index.html)
-
-We have [API documentation for the entire standard
-library](std/index.html). There's a list of crates on the left with more
-specific sections, or you can use the search bar at the top to search for
-something if you know its name.
-
-# The Rustonomicon
-
-[The Rustonomicon] is an entire book dedicated to explaining
-how to write `unsafe` Rust code. It is for advanced Rust programmers.
-
-[The Rustonomicon]: nomicon/index.html
-
-# The Error Index
-
-If you encounter an error while compiling your code you may be able to look it
-up in the [Rust Compiler Error Index](error-index.html).