more accurate homepage title

docs/_includes/header.html

@@ -6,7 +6,7 @@
 <meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
 
 <title>
-  {% if page.title == "Bootstrap" %}
+  {% if page.url == site.baseurl %}
     {{ page.title }}
   {% else %}
     {{ page.title }} &middot; Bootstrap

docs/index.html

 ---
 layout: home
-title: Bootstrap
+title: Bootstrap · The world's most popular mobile-first and responsive front-end framework.
 ---
 
 <main class="bs-docs-masthead" id="content" role="main">