Update public/index.html

public/index.html

@@ -1014,7 +1014,7 @@ Implementations, and Perspectives
                             <i class="bi bi-geo-alt ">Schellingstr. 24, 70174 Stuttgart </i>
                             <p>Postfach 101452, 70013 Stuttgart</p>
                              <i class="bi bi-telephone "> +49 (0)711 8926 0</i>
-                            <i class="bi bi-envelope "> knight(at)hft-stuttgart.de</p>
+                            <i class="bi bi-envelope "> knight(at)hft-stuttgart.de</i>
 
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