Users should be able to move pages

[travis]

Users should be able to:

1. move subpages to new parents
2. move subpages to be top-level pages
3. move top-level pages to be subpages of another page

This is mostly just implementing the ability to move page containers around. With the current implementation of NSS this may require moving the container's entire subtree item-by-item, but the implementor of this feature should investigate options thoroughly and ideally report back here before moving forward with implementation.

[travis]

reported in #10

[scenaristeur]

Hi did you take a look at @jeffz solid-file-client that comes with a moveFolder function. Or copy/delete https://github.com/jeff-zucker/solid-file-client ?😊

[travis]

indeed, this looks like it could be very helpful!