Fix templates.

	- Use materialize.css classes in table.
	- Add waves to button.

aleksis/apps/alsijil/templates/alsijil/lesson.html

@@ -53,7 +53,7 @@
       </span>
       {{ personal_note_formset.management_form }}
 
-      <table class="table table-striped table-bordered table-hover table-responsive-xl">
+      <table class="striped responsive-table">
         <tr>
           <th>{% blocktrans %}Person{% endblocktrans %}</th>
           <th>{% blocktrans %}Absent{% endblocktrans %}</th>

aleksis/apps/alsijil/templates/alsijil/week_view.html

@@ -12,7 +12,7 @@
       <ul id="timetable_select_form">
         {% form form=select_form %}{% endform %}
       </ul>
-      <button type="submit" class="btn btn-dark">
+      <button type="submit" class="btn btn-dark waves-light">
         {% blocktrans %}Select{% endblocktrans %}
       </button>
     </form>