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/comment/_macros.pug

@@ -0,0 +1,46 @@
+| {%- macro render_comment(comment, is_reply) -%}
+.comment-container(
+	id="{{ comment._id }}",
+	data-node-id="{{ comment._id }}",
+	class="{% if is_reply %}is-reply{% else %}is-first{% endif %}")
+
+	.comment-header
+		.comment-avatar
+			img(src="{{ comment._user.email | gravatar }}")
+
+		.comment-author(class="{% if comment._is_own %}own{% endif %}")
+			| {{ comment._user.full_name }}
+			span.username ({{ comment._user.username }})
+
+		.comment-time {{ comment._created | pretty_date_time }} {% if comment._created != comment._updated %} (edited {{ comment._updated | pretty_date_time }}){% endif %}
+
+	.comment-content {{comment.properties.content_html | safe }}
+	| {% if comment._is_own %}
+	.comment-content-preview
+	| {% endif %}
+
+	.comment-meta
+		.comment-rating(
+			class="{% if comment._current_user_rating is not none %}rated{% if comment._current_user_rating %} positive{% endif %}{% endif %}")
+			.comment-rating-value(title="Number of likes") {{ comment._rating }}
+			| {% if not comment._is_own %}
+			.comment-action-rating.up(title="Like comment")
+			| {% endif %}
+
+		.comment-action-reply(title="Reply to this comment")
+			span reply
+		| {% if comment._is_own %}
+		.comment-action-edit
+			span.edit_mode(title="Edit comment") edit
+			span.edit_save(title="Save comment")
+				i.pi-check
+				| save changes
+			span.edit_cancel(title="Cancel changes")
+				i.pi-cancel
+				| cancel
+		| {% endif %}
+
+| {% for reply in comment['_replies']['_items'] %}
+| {{ render_comment(reply, True) }}
+| {% endfor %}
+| {%- endmacro -%}