fix: redirect footer logo to the open learning (#5374)

* fix: redirect footer logo to the open learning

* fix: redirect footer logo to the open learning

* chore: update logo alt

Author: asadali145

ui/templates/footer.html

@@ -3,8 +3,8 @@
   <div class="container">
     <div class="row">
       <div class="col-md-8">
-        <a href="http://www.mit.edu" target="_blank" rel="noopener noreferrer">
-          <img src="{% static 'images/open_learning_logo.svg' %}" alt="MIT" width="150" height="38">
+        <a href="https://openlearning.mit.edu" target="_blank" rel="noopener noreferrer">
+          <img src="{% static 'images/open_learning_logo.svg' %}" alt="MIT Open Learning" width="150" height="38">
         </a>
         {% if is_public %}
           <div class="footer-button footer-cta-left">