Render description for workbooks

Author: Matthew McCullough

_layouts/workbook.html

@@ -8,6 +8,11 @@
 <!--     <span class="octicon octicon-book"></span> -->
     <h1>{{ page.title }}</h1>
     {% include license.html %}
+
+    {% if page.description %}
+    <br/>
+    <div class="description">{{ page.description }}</div>
+    {% endif %}
   </div>
 </section>
 

workbooks/github-advanced.md

@@ -1,7 +1,7 @@
 ---
 layout: workbook
 title: GitHub Advanced Workbook
-description: This student and teacher workbook will be your companion to the GitHub Advanced class taught by the [GitHub Training Team](http://training.github.com/) and other educational groups. In this course, you'll learn how to leverage all of the shortcuts, commands and advanced workflows of both Git and GitHub.
+description: This student and teacher workbook will be your companion to the GitHub Advanced class taught by the GitHub Training Team and other educational groups. In this course, you'll learn how to leverage all of the shortcuts, commands and advanced workflows of both Git and GitHub.
 
 ---
 

workbooks/github-foundations.md

@@ -1,7 +1,7 @@
 ---
 layout: workbook
 title: GitHub Foundations Workbook
-description: This student and teacher workbook will be your companion to the GitHub Foundations class taught by the [GitHub Training Team](http://training.github.com/) and other educational groups. In this course, you'll learn basic collaboration skills towards a productive use of Git and GitHub in your open source work and daily job assignments.
+description: This student and teacher workbook will be your companion to the GitHub Foundations class taught by the GitHub Training Team and other educational groups. In this course, you'll learn basic collaboration skills towards a productive use of Git and GitHub in your open source work and daily job assignments.
 
 
 ---

workbooks/github-intermediate.md

@@ -1,7 +1,7 @@
 ---
 layout: workbook
 title: GitHub Intermediate Workbook
-description: This student and teacher workbook will be your companion to the GitHub Intermediate class taught by the [GitHub Training Team](http://training.github.com/) and other educational groups. In this course, you'll learn how to extensively leverage Git and GitHub from the command line.
+description: This student and teacher workbook will be your companion to the GitHub Intermediate class taught by the GitHub Training Team and other educational groups. In this course, you'll learn how to extensively leverage Git and GitHub from the command line.
 ---