mention license in install.html.

tighter nav list.

R=r
http://go/go-review/1024029

doc/install.html

@@ -2,9 +2,15 @@
 
 <h2>Introduction</h2>
 
+<p>Go is an open source project, distributed under a
+<a href="/LICENSE">BSD-style license</a>.
+This document explains how to check out the sources,
+build them on your own machine, and run them.
+</p>
+
 <p>
 There are two distinct ways to experiment with Go.
-This document explains how to check out, build, and use the <code>gc</code> Go
+This document focuses on the <code>gc</code> Go
 compiler and tools (<code>6g</code>, <code>8g</code> etc.).
 For information on how to use <code>gccgo</code>, a more traditional
 compiler using the GCC back end, see

doc/style.css

@@ -132,11 +132,13 @@ div#linkList ul {
 
 div#linkList li {
   margin-left: 1em;
+  padding-bottom: 0.2em;
 }
 
 div#linkList li.navhead {
   font-weight: bold;
   margin-left: 0px;
+  padding-bottom: 0.25em;
 }
 
 #nav dl {