Support E Ink screens

### Is your feature request related to a problem? Please describe.
With the rise of E Ink notepads (remarkable, onyx etc), document sharing (primarily pdf) to and from such devices has seen a boom. Using the client as-is, is doable, but with a very bad experience.

### Describe the solution you'd like
An E Ink-friendly version of the client (greyscale/limited colors/no backgrounds, page turning instead of scrolling, no animations etc)

### Describe alternatives you've considered
There are no alternatives, only the possible use of optimizations on the E Ink tablet side with unsatisfactory results.