pidgin/nest

Update how to build the installer

2021-04-05, Gary Kramlich
9368cfdb3564
Update how to build the installer

* Added notes on how to install the nsis inetc plugin
* Updated signing to only include osslsigncode

Testing Done:
Ran locally via `npm run hugo:server`

Reviewed at https://reviews.imfreedom.org/r/594/
Alan Hoskins <alanhoskins@gmail.com>
Elliott Sales de Andrade <quantum.analyst@gmail.com>
Frederick F. Kautz IV <fkautz@alumni.cmu.edu>
Gary Kramlich <grim@reaperworld.com>
Harrison <harrisonhopkins@gmail.com>
Jason Allan <code@jasonderrythomas.com>
John Bailey <rekkanoryo@rekkanoryo.org>
Richard Laager <rlaager@wiktel.com>
Robert Vehse <robertvehse@fastmail.fm>
Sorvival <sorvival@tutanota.com>
Zero <programmingzero@gmail.com>