index.html: Fix redundant end of link tag

Author: solb

Diff for: index.html

@@ -12,7 +12,7 @@ <h1>Efficient Computing at Carnegie Mellon</h1>
 <a href="https://www.cs.cmu.edu/~dga">Professor David G. Andersen</a> and
 <a href="https://www.cs.cmu.edu/~kaminsky">Dr. Michael Kaminsky</a>
 in the <a href="https://www.cmu.edu">Carnegie Mellon University</a>
-<a href="https://csd.cs.cmu.edu">Computer Science Department</a>.</a>
+<a href="https://csd.cs.cmu.edu">Computer Science Department</a>.
 
 
 <h2>Data structures</h2>