fix(education): sizing of panel headings

They now follow the same styling as everywhere else on the website.

module/Education/view/education/education/index.phtml

@@ -137,37 +137,37 @@ $this->headTitle($this->translate('Education'));
             <div class="col-md-6">
                 <div class="panel panel-default">
                     <div class="panel-heading">
-                        <span class="h4"><?= $this->translate('Books') ?></span>
+                        <h3><?= $this->translate('Books') ?></h3>
                     </div>
                     <div class="panel-body">
                         <p><?= $this->translate('Order your course books via GEWIS to receive a discount. Specific ordering deadlines and pickup dates will be timely communicated to you via an email.') ?></p>
                     </div>
                     <div class="panel-footer panel-footer--links">
                         <a href="https://gewis.nl/boeken" title="<?= $this->translate('Visit the webshop') ?>"
-                           class="panel-footer__link--primary"
+                           class="panel-footer__link"
                            target="_blank"><?= $this->translate('Visit webshop') ?></a>
                     </div>
                 </div>
             </div>
             <div class="col-md-6">
                 <div class="panel panel-default">
                     <div class="panel-heading">
-                        <span class="h4"><?= $this->translate('Tutoring') ?></span>
+                        <h3><?= $this->translate('Tutoring') ?></h3>
                     </div>
                     <div class="panel-body">
                         <p><?= $this->translate('Are you looking for someone to help you with your courses? Send an email using one of the following links and we can help you find someone to tutor you.') ?></p>
                     </div>
                     <div class="panel-footer panel-footer--links">
                         <a href="mailto:[email protected]" title="<?= $this->translate('Tutoring CS') ?>"
-                           class="panel-footer__link--primary"
+                           class="panel-footer__link"
                            target="_blank"
                            style="margin-right:12px;"><?= $this->translate('Tutoring CS') ?></a>
                         <a href="mailto:[email protected]" title="<?= $this->translate('Tutoring AM') ?>"
-                           class="panel-footer__link--primary"
+                           class="panel-footer__link"
                            target="_blank"
                            style="margin-right:12px;"><?= $this->translate('Tutoring AM') ?></a>
                         <a href="mailto:[email protected]" title="<?= $this->translate('Want to be a tutor?') ?>"
-                           class="panel-footer__link--primary"
+                           class="panel-footer__link"
                            target="_blank"><?= $this->translate('Want to be a tutor?') ?></a>
                     </div>
                 </div>