Merge pull request jashkenas#1697 from showell/doc-usage

split out Usage section

documentation/index.html.erb

@@ -44,7 +44,8 @@
       </div>
       <div class="contents menu">
         <a href="#overview">Overview</a>
-        <a href="#installation">Installation and Usage</a>
+        <a href="#installation">Installation</a>
+        <a href="#usage">Usage</a>
         <a href="#language">Language Reference</a>
         <a href="#literals">Literals: Functions, Objects and Arrays</a>
         <a href="#lexical_scope">Lexical Scoping and Variable Safety</a>
@@ -147,7 +148,7 @@
 
     <h2>
       <span id="installation" class="bookmark"></span>
-      Installation and Usage
+      Installation
     </h2>
 
     <p>
@@ -196,6 +197,11 @@ sudo bin/cake install</pre>
       <a href="https://github.com/alisey/CoffeeScript-Compiler-for-Windows">CoffeeScript Compiler For Windows</a>.
     </p>
 
+    <h2>
+      <span id="usage" class="bookmark"></span>
+      Usage
+    </h2>
+
     <p>
       Once installed, you should have access to the <tt>coffee</tt> command,
       which can execute scripts, compile <tt>.coffee</tt> files into <tt>.js</tt>,