Refinements to preview page right sidebar (templates as a list, and moving of buttons)
Context
The UI is currently a bit unworkable with the current template scroll area, especially on smaller screen sizes.
Proposal
- Change template thumbnails from a grid of cards to just a list where you can select one template at a time (this shouldn't overwrite work done to make a default template selected when you enter the page, so that the preview loads when you first enter the page)
- Get some more vertical real estate to have more space for the new templates list style (change defined above): move download PDF and download EPUB to the bottom of the page so that the scroll area for the templates list is bigger