Rollup merge of #38480 - clarcharr:import_css, r=steveklabnik

Don't @import normalize.css.

This lets the browser load both files in parallel instead of waiting for `rustdoc.css` to load first.

src/librustdoc/html/layout.rs

@@ -46,6 +46,7 @@ pub fn render<T: fmt::Display, S: fmt::Display>(
 
     <title>{title}</title>
 
+    <link rel="stylesheet" type="text/css" href="{root_path}normalize.css">
     <link rel="stylesheet" type="text/css" href="{root_path}rustdoc.css">
     <link rel="stylesheet" type="text/css" href="{root_path}main.css">
     {css_extension}

src/librustdoc/html/static/rustdoc.css

@@ -1,5 +1,3 @@
-@import "normalize.css";
-
 /**
  * Copyright 2013 The Rust Project Developers. See the COPYRIGHT
  * file at the top-level directory of this distribution and at