Fix typo on front page (#17)

Author: KyleQ1

index.html

@@ -53,7 +53,7 @@ <h2 id="Our_vision">Our vision</h2>
     </ol>
     <h2 id="What_students_will_learn">What students will learn</h2>
     <p>The software subteam programs the robot to make it move and automate
-    part s of its functionality. Our goal is to expose you to the software
+    parts of its functionality. Our goal is to expose you to the software
     engineering process in a low-risk, collaborative learning environment so
     that if you eventually move on to computer science in college or in
     industry, you'll have all the tools you need to succeed.</p>