Delete a website page

Takes a page off the website and frees the address it answered at. Needs content: write, and is a write.

The document is kept, so deleting the wrong page is recoverable by Commune, but there is no operation here that undoes it: write the page again. The address is available immediately, which is the half worth knowing before you call this, because a pattern that was shadowed by this page starts serving that URL.

A page Commune has taken down cannot be deleted: its address stays reserved while that stands, so that it cannot be re-registered.

Answers the page as it was, so the response is a record of what was removed rather than an empty body.

Publishes no event.