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/
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