Remove ability to delete level requirements from level detail

To return in future in a special 'edit mode' page, but easiest to just nuke them entirely for now as it's not something we often need to do

training/templates/level_detail.html

@@ -78,11 +78,6 @@ <h4 class="card-header">Description</h4>
             </tr>
             {% endfor %}
             <tr><th colspan="3" class="text-center">{{object}}</th></tr>
-            <tr>
-              <td><ul class="list-unstyled">{% for req in object.started_requirements %}<li>{{ req.item }} {% user_has_qualification u req.item 0 %} {% if request.user.is_supervisor %}<a type="button" class="btn btn-link tn-sm p-0 align-baseline" href="{% url 'remove_requirement' pk=req.pk %}"><span class="fas fa-trash-alt text-danger"></span></a>{%endif%}</li>{% endfor %}</ul></td>
-              <td><ul class="list-unstyled">{% for req in object.complete_requirements %}<li>{{ req.item }} {% user_has_qualification u req.item 1 %} {% if request.user.is_supervisor %}<a type="button" class="btn btn-link tn-sm p-0 align-baseline" href="{% url 'remove_requirement' pk=req.pk %}"><span class="fas fa-trash-alt text-danger"></span></a>{%endif%}</li>{% endfor %}</ul></td>
-              <td><ul class="list-unstyled">{% for req in object.passed_out_requirements %}<li>{{ req.item }} {% user_has_qualification u req.item 2 %} {% if request.user.is_supervisor %}<a type="button" class="btn btn-link tn-sm p-0 align-baseline"" href="{% url 'remove_requirement' pk=req.pk %}" title="Delete requirement"><span class="fas fa-trash-alt text-danger"></span></a>{%endif%}</li>{% endfor %}</ul></td>
-            </tr>
           </tbody>
         </table>
     </div>