update html header

ner.edith.html

@@ -42,7 +42,8 @@
         <div class="col-8">
             <div class="row">
                 <div class="col text-center">
-                    <h3><a href="https://github.com/cneud/ner.edith" target="_blank">ner.edith</a>: <br/> named entity recognition editor in html</h3>
+                    <h3><a href="https://github.com/cneud/ner.edith" target="_blank">ner.edith</a>: named entity recognition editor in html</h3>
+                    <a href="https://github.com/cneud/ner.edith/blob/master/docs/User_Guide.md" target="_blank">User Guide</a> | <a href="https://github.com/cneud/ner.edith/blob/master/docs/Annotation_Guidelines.md" target="_blank">Annotation Guidelines</a> | <a href="https://github.com/cneud/ner.edith/issues" target="_blank">Issues</a><hr>
                 </div>
             </div>
         </div>