Create page dialog should appear as ghost that explains where we've looked for the page and offers to create a new one. Don't create page on bogus url reference either.
✔ Create a ghostly future page instead of creating and storing a new page when clicking a link to nowhere.
✔ Check that url references go through the same logic.
✔ Add a button to the future page that offeres to create it.
✔ Write a handler for the button.
✔ Make the future page a real, persistent page in the appropriate (local or origin) store.
✔ Revise the dom to have no story and no journal.
✔ Put a create for the page.
✔ Add the echo'd create to the dom's journal.