Use https, fix broken links and unneeded redirects.

docs/migration.html

@@ -11,7 +11,7 @@ lead: "Guidance on how to upgrade from Bootstrap v2.x to v3.x with emphasis on m
 <div class="bs-docs-section">
   <h1 class="page-header">Migrating from 2.x to 3.0</h1>
 
-  <p class="lead">Bootstrap 3 is not backwards compatible with v2.x. Use this section as a general guide to upgrading from v2.x to v3.0. For a broader overview, see <a href="http://blog.getbootstrap.com/2013/08/19/bootstrap-3-released/">what's new</a> in the v3.0 release announcement.</p>
+  <p class="lead">Bootstrap 3 is not backwards compatible with v2.x. Use this section as a general guide to upgrading from v2.x to v3.0. For a broader overview, see <a href="https://blog.getbootstrap.com/2013/08/19/bootstrap-3-released/">what's new</a> in the v3.0 release announcement.</p>
 
   <h2 id="classes">Major class changes</h2>
   <p>This table shows the style changes between v2.x and v3.0.</p>
@@ -441,5 +441,5 @@ lead: "Guidance on how to upgrade from Bootstrap v2.x to v3.x with emphasis on m
     <li>The checkbox and radio features of the button.js plugin now both use <code>data-toggle="buttons"</code> instead of <code>data-toggle="buttons-checkbox"</code> or <code>data-toggle="buttons-radio"</code> in their markup.</li>
     <li>JavaScript events are namespaced. For example, to handle the modal "show" event, use <code>'show.bs.modal'</code>. For tabs "shown" use <code>'shown.bs.tab'</code>, etc.</li>
   </ul>
-  <p>For more information on upgrading to v3.0, and code snippets from the community, see <a href="http://bootply.com/">Bootply</a>.</p>
+  <p>For more information on upgrading to v3.0, and code snippets from the community, see <a href="https://www.bootply.com/">Bootply</a>.</p>
 </div>