templates: Move week-related includes to a folder

In preparation to adding a new page, move the week-related included files in a specific
sub-folder.
Change includes accordingly.

templates/index.html.tera

@@ -102,9 +102,9 @@
                 {% set truth_index = truth.number - index_delta %}
 
                 {% if user.is_admin == true %}
-                    {% include "editable_truth" %}
+                    {% include "weeks/editable_truth" %}
                 {% else %}
-                    {% include "truth" %}
+                    {% include "weeks/truth" %}
                 {% endif %}
             {% endfor %}
 
@@ -125,7 +125,7 @@
             <div class="individual_truth">
                 <h3>Nouvelle vérité</h3>
                 <form action="/{{ week_data.number }}/new_truth" method="POST">
-                    {% include "truth_editor" %}
+                    {% include "weeks/truth_editor" %}
                 </form>
             </div>
         {% endif %}

templates/weeks/editable_truth.tera

@@ -3,6 +3,6 @@
     <p>{{ truth.rendered_text | safe }}</p>
     <hr/>
     <form action="/{{ week_data.number }}/edit/{{ truth.number }}" method="POST">
-        {% include "truth_editor" %}
+        {% include "weeks/truth_editor" %}
     </form>
 </div>