add some help to the rapid marking pages

rapids/templates/rapids/mark.html

@@ -12,10 +12,24 @@
                 This questions has unmarked answers. Are you sure you want to review?
             </div>
         {% endif %}
+        <details>
+            <summary><i class="bi bi-info-circle"></i> Help</summary>
+            <p>Unmarked questions will be shown below. To mark the question, click on the answer to toggle through the markers.</p>
+            <p>The colour of the answer will change to reflect the mark given.</p>
+            <p>Answers will be automatically marked.</p>
+            <p>By default only answers for the current exam will be shown. Click the link to view all answers.</p>
+            <h4>Buttons</h4>
+            <ul>
+                <li>Previous: Go to the previous question</li>
+                <li>Save: Save your changes and stay on the same question</li>
+                <li>Next: Save your changes and go to the next question (will warn if not all answers have been marked)</li>
+                <li>Skip: Skip the current question allowing you to move on without marking all answers</li>
+            </ul>
+        </details>
+
 
         {% if question.normal %}
             <h3>This question is normal</h3>
-            Answers will be automatically marked.<br />
 
             {% if incorrect_answers %}
                 <p>The following answers have been submitted for this question</p>
@@ -31,14 +45,12 @@
             {% endif %}
         {% else %}
             <h3>This question is abnormal</h3>
-            Answers given as normal will be automatically marked.<br />
             Region: {{ question.get_regions }}, Abnormalities: {{ question.get_abnormalities }}<br />
             Primary answer: <span id="primary-answer" title="The primary answer of the question">{{question.get_primary_answer}}</span>
         {% endif %}
         <div class="marking">
             <form method="POST" class="post-form">{% csrf_token %}
                 {% if not question.normal %}
-                    Click each answer to toggle through marks awarded (as per colour)<br/>
                     {% if not review %}
                         {% if unmarked_exam_answers_only %}
                             Showing unmarked exam answers only <a href="{% url 'rapids:mark_all' exam.id question_number %}">(view all answers for question)</a>