Mark page to not be published (rough work)

It would be cool to mark a page to not be published so that we could use to proof of concept (POC) our ideas.

A prime example would be styling elements within the embed tag from custom code (styling of products, using images in particles.js).

This would save time instead of tweaking CSS in chrome’s developer console

to further illustrate, it would be nice to not index certain pages with a checkbox