Update navigation links to match updated Training site

Author: jordanmccullough

_includes/navigation.html

@@ -9,10 +9,10 @@ <h1 id="logo" class="content">
 					<a href="https://training.github.com/trainers/">Trainers</a>
 				</li>
 				<li>
-					<a href="https://training.github.com/web/">Web-based</a>
+					<a href="https://training.github.com/courses/">Courses</a>
 				</li>
 				<li>
-					<a href="https://training.github.com/in-person/">In-person</a>
+					<a href="https://training.github.com/schedule/">Schedule</a>
 				</li>
 				<li class="current">
 					<a href="https://training.github.com/kit/">Kit</a>