Suggestion: bool Draft in document front matter for hiding in plain site documents

[devlead]

Sometimes you want to let other people review a page, it's not super secret content, would be nice if the document could be rendered, so you've got an URL to share, but it wouldn't appear in any RSS/Atom feeds, sitemaps, menus, etc.

My suggestion would be to be able to set a flag in frontmatter

Draft: true