Refactor render_secondary_navigation macro

* Use navigation_links instead of pages.
* Use secondary navigation mixin.
* Always include project category.
* Always include Explore tab.

Should be eventually moved to Blender Cloud repo.

src/templates/projects/_macros.pug

@@ -1,29 +1,29 @@
-| {% macro render_secondary_navigation(project, pages=None) %}
+include ../mixins/components
-nav.navbar-secondary
+
-	nav.collapse.navbar-collapse
+| {% macro render_secondary_navigation(project, navigation_links, title) %}
-		ul.navbar-nav.navbar-right
+
-			li
+| {% if project.category == 'course' %}
-				a.navbar-item(
+| {% set category_url = url_for('cloud.courses') %}
-					href="{{ url_for('projects.view', project_url=project.url) }}",
+| {% elif project.category == 'workshop' %}
-					title="{{ project.name }} Homepage")
+| {% set category_url = url_for('cloud.workshops') %}
-					span
+| {% elif project.category == 'film' %}
-						b {{ project.name }}
+| {% set category_url = url_for('cloud.open_projects') %}
-			li
+| {% else %}
-				a.navbar-item(
+| {% set category_url = url_for('main.index') %}
-				href="{{ url_for('main.project_blog', project_url=project.url) }}",
+| {% endif %}
-				title="Project Blog",
+
-				class="{% if category == 'blog' %}active{% endif %}")
++nav-secondary()
-					span Blog
+	li.text-capitalize
-			| {% if pages %}
+		a.nav-link.text-muted.px-0(href="{{ category_url }}")
-			| {% for p in pages %}
+			| {{ project.category }}
-			li
+	li.px-1
-				a.navbar-item(
+		i.pi-angle-right
-				href="{{ url_for('projects.view_node', project_url=project.url, node_id=p._id) }}",
+
-				title="{{ p.name }}",
+	+nav-secondary-link(
-				class="{% if category == 'page' %}active{% endif %}")
+		class="px-0 font-weight-bold",
-					span {{ p.name }}
+		href="{{url_for('projects.view', project_url=project.url, _external=True)}}")
-			| {% endfor %}
+		| {{ project.name }}
-			| {% endif %}
+
 	| {% if project.nodes_featured %}
 	| {# In some cases featured_nodes might might be embedded #}
 	| {% if '_id' in project.nodes_featured[0] %}
@@ -31,11 +31,16 @@ nav.navbar-secondary
 	| {% else %}
 	| {% set featured_node_id=project.nodes_featured[0] %}
 	| {% endif %}
-			li
+	+nav-secondary-link(
-				a.navbar-item(
 			href="{{ url_for('projects.view_node', project_url=project.url, node_id=featured_node_id) }}",
 			title="Explore {{ project.name }}",
-				class="{% if category == 'blog' %}active{% endif %}")
+			class="{% if title == 'project' %}active{% endif %}")
-					span Explore
+			| Explore
 	| {% endif %}
+
+	| {% for link in navigation_links %}
+	+nav-secondary-link(href="{{ link['url'] }}")
+		| {{ link['label'] }}
+	| {% endfor %}
+
 | {% endmacro %}