rename manual files to fit new naming convention

app/templates/_base/_modals/manual.html.j2

@@ -13,35 +13,35 @@
     </ul>
     <div id="manual-modal-introduction">
       <br>
-      {% include "_base/_modals/_manual/_01_introduction.html.j2" %}
+      {% include "_base/_modals/_manual/01_introduction.html.j2" %}
     </div>
     <div id="manual-modal-registration-and-log-in">
       <br>
-      {% include "_base/_modals/_manual/_02_registration_and_log_in.html.j2" %}
+      {% include "_base/_modals/_manual/02_registration_and_log_in.html.j2" %}
     </div>
     <div id="manual-modal-dashboard">
       <br>
-      {% include "_base/_modals/_manual/_03_dashboard.html.j2" %}
+      {% include "_base/_modals/_manual/03_dashboard.html.j2" %}
     </div>
     <div id="manual-modal-services">
       <br>
-      {% include "_base/_modals/_manual/_06_services.html.j2" %}
+      {% include "_base/_modals/_manual/06_services.html.j2" %}
     </div>
     <div id="manual-modal-a-closer-look-at-the-corpus-analysis">
       <br>
-      {% include "_base/_modals/_manual/_07_a_closer_look_at_the_corpus_analysis.html.j2" %}
+      {% include "_base/_modals/_manual/07_a_closer_look_at_the_corpus_analysis.html.j2" %}
     </div>
     <div id="manual-modal-cqp-query-language">
       <br>
-      {% include "_base/_modals/_manual/_08_cqp_query_language.html.j2" %}
+      {% include "_base/_modals/_manual/08_cqp_query_language.html.j2" %}
     </div>
     <div id="manual-modal-query-builder">
       <br>
-      {% include "_base/_modals/_manual/_09_query_builder.html.j2" %}
+      {% include "_base/_modals/_manual/09_query_builder.html.j2" %}
     </div>
     <div id="manual-modal-tagsets">
       <br>
-      {% include "_base/_modals/_manual/_10_tagsets.html.j2" %}
+      {% include "_base/_modals/_manual/10_tagsets.html.j2" %}
     </div>
   </div>
   <div class="modal-footer">