[docs] EPUB Version is too big.

[Michał Listowski]

Hello
I believe that you should cut epub file in parts like PDF. This one file is almost unreadable for most of readers like Pocketbook or 
Kindle (after convert to mobi).
When i open on PocketBook Inkpad 3 it shows me that file have 5500+ pages, even start to change pages is really difficuld for device.
I think on tablets it's not a big problem because CPU in them are faster.

Thanks a lot for your work and response
Michał Listowski