Genode Foundations book format

[astian]

Hi,

Looking for interesting things to read I came across this book, but
would like to know if the last version (apparently 18.05) is available
in some format less damned inflexible than PDF.

Searching around turned up this URL:

  https://genode.org/documentation/genode-foundations-16-05.epub

Which is ideal, except that an "...-18-05.epub" does not seem to exist.

Thanks.