Finally got slideshow working with collections. Incomplete slideshow.

Signed-off-by: Tanya Gray <Tanya@Wonkbook.local>
Fixed display of individual chapters

Signed-off-by: Tanya Gray <Tanya@Wonkbook.local>
Moved all presentation slides to a collection

Signed-off-by: Tanya Gray <Tanya@Wonkbook.local>
Fixed title slide class

Signed-off-by: Tanya Gray <Tanya@Wonkbook.local>