Update install.html

Updated link.

Author: sreichel

de/openmage/install.html

@@ -66,7 +66,7 @@ <h2 class="graphic-info__title">Installation über Composer</h2>
                 <h4 class="card-title">Installations-Anleitung</h4>
                 <p class="install-instructions__warning">
                     Hier weiterlesen:
-                    <a href="https://docs.openmage.org/users/install/_use-composer/">https://docs.openmage.org/users/install/use-composer/</a>
+                    <a href="https://docs.openmage.org/users/install/use-composer/">https://docs.openmage.org/users/install/use-composer/</a>
                 </p>
             </div>
         </div>