* The root location now shows all lists
* The specific list locations show only the specified list
* Each list can be individually edited
* Use the card columns (masonry) layout when showing all lists
* No longer support HTML previewing, just switch between editing
and viewing (ala Github comments)
* Include the Bootstrap v4.0.0-beta3 SCSS sources
* Use the old custom.css as a basis for wishlist.scss
* Set the correct column count based on the media sizes
* Manage the vector of loads lists in the state
* Use a struct as the context for the index template
* Rework the _layout and index templates; remove hardcoded examples
