Migrate Jade to Pug template engine

Jade templates engine has been renamed to Pug.

We are using Pug already on the Blender Cloud repository, following is Flamenco and Attract

src/templates/nodes/custom/post/view_main_project.pug

@@ -0,0 +1,54 @@
+| {% extends 'layout.html' %}
+
+| {% block og %}
+meta(property="og:title", content="{{ node.name }}")
+meta(property="og:url", content="{{ url_for('main.main_blog', url=node.properties.url, _external=True)}}")
+meta(property="og:type", content="website")
+| {% if node.picture %}
+meta(property="og:image", content="{{ node.picture.thumbnail('l', api=api) }}")
+| {% endif %}
+meta(property="og:description", content="Blender Cloud is a web based service developed by Blender Institute that allows people to access the training videos and all the data from the open projects.")
+
+meta(name="twitter:title", content="{{ node.name }}")
+meta(name="twitter:description", content="Blender Cloud is a web based service developed by Blender Institute that allows people to access the training videos and all the data from the open projects.")
+| {% if node.picture %}
+meta(property="og:image", content="{{ node.picture.thumbnail('l', api=api) }}")
+| {% endif %}
+| {% endblock %}
+
+| {% block page_title %}{{node.name}} - Blog{% endblock%}
+
+| {% set title = 'blog' %}
+
+| {% block body %}
+
+.container
+	| {% include 'nodes/custom/post/view_embed.html' %}
+
+| {% endblock %}
+
+
+| {% block footer_scripts %}
+
+script.
+	hopToTop(); // Display jump to top button
+
+	/* Expand images when their link points to a jpg/png/gif */
+	/* TODO: De-duplicate code from view post */
+	var page_overlay = document.getElementById('page-overlay');
+	$('.blog_index-item .item-content a img').on('click', function (e) {
+		e.preventDefault();
+
+		var href = $(this).parent().attr('href').split("?")[0];
+		var src = $(this).attr('src');
+
+
+		if (href.match("jpg$") || href.match("png$") || href.match("gif$")) {
+			$(page_overlay)
+				.addClass('active')
+				.html('<img src="' + src + '"/>');
+		} else {
+			window.location.href = href;
+		}
+	});
+| {% endblock %}