fix semantic HTML

cl-theme/templates/article_info.html

@@ -1,5 +1,5 @@
 <!-- post footer -->
-<div class="card-content-footer">
+<footer class="card-content-footer">
     <span class="soumaicon">
         <svg>
             <use href="{{ SITEURL }}/{{ THEME_STATIC_DIR }}/images/icons/master.svg#calendar" />
@@ -62,6 +62,6 @@
     {% else %}
     {% endif %}
 
-</div>
+</footer>
 <!-- end of post footer -->
 <!-- /.post-info -->

cl-theme/templates/base.html

@@ -108,7 +108,7 @@
         <!-- end page header -->
 
         <!-- page content -->
-        <div class="main-content">
+        <main class="main-content">
             {%- block content -%}
                 <div class="container">
                     <!-- start of posts -->
@@ -190,7 +190,7 @@
                 {% include "pagination.html" %}
                 <!-- end of pagination -->
             {%- endblock -%}
-        </div>
+        </main>
         <!-- end of page content -->
         <!-- .site-content -->