clarify some docs, improve layout

docs/_includes/nav-docs.html

 <header class="navbar navbar-static-top bd-sidebar" id="top" role="banner">
   <a href="{{ site.baseurl }}/" class="navbar-brand">
-    Bootstrap
+    Bootstrap v4 alpha
   </a>
 
   <button class="navbar-toggler hidden-sm-up" type="button" data-toggle="collapse" data-target="#docsNavbarContent">

docs/_includes/nav-home.html

 <header class="bd-header" role="banner">
-  <a class="bd-header-mark" href="{{ site.baseurl }}">Bootstrap</a>
+  <a class="bd-header-mark" href="{{ site.baseurl }}">Bootstrap 4 alpha</a>
 
   <nav class="nav nav-pills bd-header-nav">
     <a class="nav-link" href="{{ site.baseurl }}/getting-started/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Docs');">Documentation</a>

docs/assets/scss/_component-examples.scss

@@ -28,11 +28,16 @@
   @include media-breakpoint-up(sm) {
     margin-left: 0;
     margin-right: 0;
-    margin-bottom: -1rem;
+    margin-bottom: 0;
     padding: 1.5rem;
     border-width: .2rem;
   }
 
+  + .highlight,
+  + .zero-clipboard + .highlight {
+    margin-top: -1rem;
+  }
+
   + p {
     margin-top: 2rem;
   }

docs/assets/scss/_homepage.scss

@@ -164,6 +164,10 @@
   text-align: center;
   background-color: #fff;
   border-top: 1px solid #eee;
+
+  .highlight {
+    text-align: left;
+  }
 }
 
 .bd-featurette-title {

docs/components/reboot.md

@@ -113,7 +113,7 @@ The `<pre>` element is reset to remove its `margin-top` and use `rem` units for
 
 ## Tables
 
-Tables are slightly adjusted to style `<caption>`s and ensure consistent `text-align` throughout.
+Tables are slightly adjusted to style `<caption>`s and ensure consistent `text-align` throughout. Additional changes for borders, padding, and more come with [the `.table` class](/components/tables/).
 
 <div class="bd-example">
   <table>
@@ -156,7 +156,7 @@ Tables are slightly adjusted to style `<caption>`s and ensure consistent `text-a
 Various form elements have been rebooted for simpler base styles. Here are some of the most notable changes:
 
 - `<fieldset>`s have no borders, padding, or margin so they can be easily used as wrappers for individual inputs or groups of inputs.
-= `<legend>`s, like fieldsets, have also been restyled to be displayed as a heading of sorts.
+- `<legend>`s, like fieldsets, have also been restyled to be displayed as a heading of sorts.
 - `<label>`s are set to `display: inline-block` to allow `margin` to be applied.
 - `<input>`s, `<selects>`s, `<textareas>`s, and `<buttons>`s are mostly addressed by Normalize, but Reboot removes their `margin` and sets `line-height: inherit`, too.
 - `<textarea>`s are modified to only be resizeble vertically as horizontal resizing often "breaks" page layout.

docs/index.html

@@ -27,14 +27,32 @@ title: Bootstrap · The world's most popular mobile-first and responsive f
     <div class="row">
       <div class="col-sm-4">
         <h4>Package managers</h4>
+        <p>Bootstrap is available via Bower, Composer, Meteor, and npm.</p>
+{% highlight bash %}
+$ npm install bootstrap
+$ bower install bootstrap
+$ meteor add twbs:bootstrap
+$ composer require twbs/bootstrap
+{% endhighlight %}
       </div>
       <div class="col-sm-4">
         <h4>Download from GitHub</h4>
+        <p>You can also <a href="{{ site.repo }}">download the source files</a> from GitHub where our code, issue tracker, and more are hosted.</p>
       </div>
       <div class="col-sm-4">
         <h4>Bootstrap CDN</h4>
+        <p>Quickly include Bootstrap into a project with the Bootstrap CDN, a free service provided by the MaxCDN folks. Just copy and paste the CSS and JS as needed.</p>
+{% highlight html %}
+<link rel="stylesheet" href="{{ site.cdn.css }}">
+<script src="{{ site.cdn.js }}"></script>
+{% endhighlight %}
       </div>
     </div>
+
+    <hr class="half-rule">
+
+    <p class="lead">More customized builds of Bootstrap's CSS and JS are also available.</p>
+    <a href="{{ site.baseurl }}/getting-started/download" class="btn btn-outline btn-lg">More download options</a>
   </div>
 </div>