Add the cancel button for a task form.

templates/partials/task_form.html

@@ -6,6 +6,7 @@
     {{ task_form|crispy }}
     {% if task %}
       <button type="submit" hx-post="{% url 'tasks:task-update' task.id %}">Submit</button>
+      <button hx-post="{% url 'tasks:task-item' task.id %}">Cancel</button>
     {% else %}
       <button type="submit" hx-post=".">Submit</button>
     {% endif %}