fix User Guide link

neath.html

@@ -56,7 +56,7 @@
             <div class="row">
                 <div class="col text-center">
                     <h3><a href="https://github.com/qurator-spk/neath" target="_blank" tabindex="-1">neath</a>: named entity annotation tool</h3>
-                    <a href="https://github.com/qurator-spk/neath/blob/master/User_Guide.md" target="_blank"  tabindex="-1">User Guide</a> | <a href="https://github.com/qurator-spk/neath/blob/master/Annotation_Guidelines.pdf" target="_blank" tabindex="-1">Annotation Guidelines</a> | <a href="https://github.com/qurator-spk/neath/issues" target="_blank" tabindex="-1">Issues</a><hr>
+                    <a href="https://github.com/qurator-spk/neath/blob/master/README.md#2-user-guide" target="_blank"  tabindex="-1">User Guide</a> | <a href="https://github.com/qurator-spk/neath/blob/master/Annotation_Guidelines.pdf" target="_blank" tabindex="-1">Annotation Guidelines</a> | <a href="https://github.com/qurator-spk/neath/issues" target="_blank" tabindex="-1">Issues</a><hr>
                 </div>
             </div>
         </div>