don't show "Access tokens" headings on all pages

src/tjts5901/templates/addItem.html

 {% extends 'base.html' %}
 
 {% block header %}
-<h1>{% block title %}Access tokens{% endblock %}</h1>
+<h1>{% block title %}Sell items{% endblock %}</h1>
 {% endblock %}
 
 {% block content %}

src/tjts5901/templates/listBid.html

 {% extends 'base.html' %}
 
 {% block header %}
-  <h1>{% block title %}Access tokens{% endblock %}</h1>
+  <h1>{% block title %}View all items currently on auction {% endblock %}</h1>
 {% endblock %}
 
 {% block content %}