[qa] Exclude gitian figs and other docs unrelated and not useful on Windows from Win installer (.exe)
The Windows installer is built to include (and install) a bunch of documentation files which are not relevant to Windows.
e.g. there is a gitian-building
folder which includes only images used by the Gitian building docs, but not the actual docs...
This is probably a result of desynchronization between our doc structure and the NSIS installer build instructions.
Either way, we need to decide if we include all docs (even non Windows relevant ones) or trim it down sensibly. There are further docs such as build instructions related to other OS's and a README_osx.md
, maybe more.