wagtail_bakerydemo/bakerydemo/jinja2/includes/pagination.html

<nav class="pagination" aria-label="Pagination">
    <ul class="pagination__list">
        {% if subpages.has_previous %}
            <li class="page-item">
                <a href="?page={{ subpages.previous_page_number }}" class="page-link previous arrows">previous</a>
            </li>
        {% else %}
            <li class="page-item disabled">
                <a class="page-link">previous</a>
            </li>
        {% endif %}

        {% for i in subpages.paginator.page_range %}
            {% if subpages.number == i %}
                <li class="page-item active"><span>{{ i }} <span class="sr-only">(current)</span></span></li>
            {% else %}
                <li class="page-item"><a href="?page={{ query_string|urlencode }}&amp;page={{ i }}" class="page-link">{{ i }}</a></li>
            {% endif %}
        {% endfor %}

        {% if subpages.has_next %}
            <li class="page-item">
                <a href="?page={{ subpages.next_page_number }}" class="page-link next arrows">next</a>
            </li>
        {% else %}
            <li class="page-item disabled">
                <a class="page-link">next</a>
            </li>
        {% endif %}
    </ul>
</nav>