Move project-main to Blender Cloud

Also remove calls to project-landing, it is now part of project-main.
It was just a few lines of code not worth having a different CSS file.

src/templates/nodes/custom/page/view_embed.pug

@@ -5,9 +5,7 @@
 header
 	img.header(src="{{ node.picture.thumbnail('h', api=api) }}")
 | {% endif  %}
-| {% block navbar_secondary %}
-| {{ super() }}
-| {% endblock navbar_secondary %}
+
 #node-container
 	#node-overlay