fixed mmdi 26/27 link in navigation bar

Author: tobideusser

_includes/navigation.html

@@ -23,7 +23,7 @@
         <a href="{{ site.baseurl }}/teaching/" class="dropbtn">Teaching</a>
         <div class="dropdown-content">
           <a href="{{ site.baseurl }}/teaching/">Courses Overview</a>
-          <a href="{{ site.baseurl }}/teaching/archive/mmdi2627/">MMD I (WS 26/27)</a>
+          <a href="{{ site.baseurl }}/teaching/mmdi2627/">MMD I (WS 26/27)</a>
           <!-- <a href="{{ site.baseurl }}/teaching/archive/xai26/">Lab: XAI (SS 26)</a>
           <a href="{{ site.baseurl }}/teaching/archive/dsma26/">Seminar: DSMA (SS 26)</a> -->
           <a href="{{ site.baseurl }}/teaching/hla2627/">Lab: HLA (WS 26/27)</a>