Revitalize Joule for a patch release

[Will O'Beirne]

#291 is a show-stopping bug for Joule which makes it uninstallable for LND v0.14.1 (and likely all future versions.) While I've been content to leave Joule to hang since it's been fairly bug-free up until now, this means we need a new release. However the state of the project is in rough shape:

• Update dependencies to known good versions
• Upgrade node-sass to be installable on ARM hardware remove unused node-sass
• Revert #244 since it would otherwise break all self signed cert installations
• Integrate @bumi's excellent work in #268 & #269 to get the extension back into the Firefox store
• Move release building to GitHub actions for consistent environment & verifiable releases

With all these done, I can release 0.5.3