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/
{
"gplugin": "keep.imfreedom.org/gplugin/gplugin/",
"libgnt": "keep.imfreedom.org/libgnt/libgnt/",
"pidgin": "keep.imfreedom.org/pidgin/pidgin/",
"plugin-pack": "keep.imfreedom.org/pidgin/purple-plugin-pack/",
"talkatu": "keep.imfreedom.org/talkatu/talkatu/",
"www": "keep.imfreedom.org/pidgin/nest/"
}