feat: display links to lessons in the top of the pages

user/themes/textbook/templates/partials/base.html.twig

@@ -26,7 +26,7 @@
     {{ assets.css()|raw }}
 
     {% block javascripts %}
-        {# TODO: ZEPTO JS PLS #}
+        {# TODO: ZEPTO JS PLEASE #}
 {# Yes! We managed to remove all these crappy dependencies \o/ #}
 {# … No we did not, not until we remake the language selector #}
 {#        {% do assets.addJs('jquery', 101) %}#}
@@ -110,6 +110,33 @@
                     {% block messages %}
                         {% include 'partials/messages.html.twig' ignore missing %}
                     {% endblock %}
+
+{#                    page.url {{  page.url }}#}
+{#                    <pre>#}
+{#                        {{ page.frontmatter|var_dump }}#}
+{#                    </pre>#}
+{#                    <pre>#}
+{#                        {{ page.header|var_dump }}#}
+{#                    </pre>#}
+
+                    {% if page.header %}
+                    {% if page.header.lessons %}
+                    <nav>
+                    <h4>📚</h4>
+                    <ul>
+                        {% for lesson in page.header.lessons %}
+                        <li>
+                            <a href="/{{ language_selector.current }}/lessons/{{ lesson.slug }}">
+                              {{ lesson.slug }}
+                            </a>
+{#                            {{ lesson.slug }}#}
+                        </li>
+                        {% endfor %}
+                    </ul>
+                    </nav>
+                    {% endif %}
+                    {% endif %}
+
                     {% block content %}{% endblock %}
                 </section>
             </section>