Rollup merge of #60489 - GuillaumeGomez:remove-hamburger, r=QuietMisdreavus
Rollup merge of #60489 - GuillaumeGomez:remove-hamburger, r=QuietMisdreavus

Remove hamburger button from source code page

Fixes #60483.

Screenshot:

<img width="575" alt="Screenshot 2019-05-03 at 00 12 51" src="https://user-images.githubusercontent.com/3050060/57110298-61ec8f00-6d38-11e9-85fd-d13be94b9c52.png">

cc @rust-lang/rustdoc

graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust