Markup Conventions: remove mention of outdated JS plugins

These are no longer used on any pages, and have since been removed
from the themes in https://github.com/jquery/jquery-wp-content/.

The one that is still used a bit is FontAwesome, but only within
the theme itself, not inside content (and I'm hoping to change that
to SVGs since for the handful of icons we use, it's quite a large
font file to load).

https://github.com/search?q=org%3Ajquery+%2F%5B%5E-%5Dicon-%2F++NOT+repo%3Ajquery%2Fdemos.jquerymobile.com+NOT+repo%3Ajquery%2Fbugs.jquery.com+NOT+repo%3Ajquery%2Fbugs.jqueryui.com+NOT+repo%3Ajquery%2Fdownload.jqueryui.com+NOT+repo%3Ajquery%2Fjquery-ui+NOT+repo%3Ajquery%2Fthemeroller.jquerymobile.com+NOT+repo%3Ajquery%2F2015-developer-summit+NOT+repo%3Ajquery%2Fevents.jquery.org+NOT+repo%3Ajquery%2Fweb-events+NOT+language%3ACSS+NOT+repo%3Ajquery%2Ftestswarm+NOT+repo%3Ajquery%2Firc.jquery.org+NOT+repo%3Ajquery%2Fjquery-wp-content+NOT+repo%3Ajquery%2Fblog.jquery.com-theme&type=code

Author: Krinkle

pages/markup-conventions.html

@@ -12,11 +12,6 @@ <h2 class="block">Tools &amp; Libraries</h2>
 <ul>
 	<li><a href="https://html5boilerplate.com" target="_blank">HTML5 Boilerplate</a></li>
 	<li><a href="http://modernizr.com" target="_blank">Modernizr</a></li>
-	<li><a href="https://github.com/scottjehl/Respond" target="_blank">Respond JS</a></li>
-	<li><a href="http://fortawesome.github.com/Font-Awesome/" target="_blank">Font Awesome</a></li>
-	<li><a href="http://foundation.zurb.com" target="_blank">Zurb Foundation (Grid only)</a></li>
-	<li><a href="https://typekit.com" target="_blank">TypeKit</a></li>
-	<li><a href="http://softwaremaniacs.org/soft/highlight/en/" target="_blank">Highlight.js</a></li>
 </ul>
 
 <h2 class="block">Background &amp; Logos</h2>
@@ -75,32 +70,6 @@ <h3>Source Code Pro</h3>
 	</code></pre>
 </div>
 
-<div class="example">
-	<h3>Font Awesome</h3>
-
-	<p>Font Awesome lets you add vector icons to just about anything. Use the <a href="http://fortawesome.github.com/Font-Awesome/icons/" target="_blank">reference
-	guide</a> to choose the right classes and icons.</p>
-
-	<p><i class="icon-circle-arrow-right"></i> This is a paragraph with an <code>&lt;i&gt;</code> element.</p>
-
-	<ul>
-		<li class="icon-exclamation-sign">Oh No!</li>
-		<li class="icon-barcode">A barcode</li>
-	</ul>
-
-	<h2><i class="icon-lightbulb"></i> Want to try it on a header?</h2>
-	<pre><code>
-&lt;p&gt;&lt;i class=&quot;icon-circle-arrow-right&quot;&gt;&lt;/i&gt; This is...&lt;/p&gt;
-
-&lt;ul&gt;
-	&lt;li class=&quot;icon-exclamation-sign&quot;&gt;Oh No!&lt;/li&gt;
-	&lt;li class=&quot;icon-barcode&quot;&gt;A barcode &lt;/li&gt;
-&lt;/ul&gt;
-
-&lt;h2&gt;&lt;i class=&quot;icon-lightbulb&quot;&gt;&lt;/i&gt; Want to...&lt;/h2&gt;
-	</code></pre>
-</div>
-
 <h2 class="block" id="foundation">Foundation</h2>
 
 <p>Please use this basic foundation for all pages:</p>