PWAsForFirefox 2.7.3

Added

• A new documentation website (#335):
  A new documentation website, located at https://pwasforfirefox.filips.si/, has been added. It replaces the old repository wiki and provides more information about the project, better usage instructions, troubleshooting pages, and an updated FAQ list.

• An ability to update package versions without editiong files (#193, thanks to @JJRcop):
  It is now possible to update the package version in Cargo.toml, Cargo.lock, and chrome.jsm with a new cargo-make-based script.
  It is also possible to update the extension package version with a new script.
  Instructions for this are displayed in the repository and the installation page.

Fixed

• Add compatibility with Firefox 116, fixing missing settings (#378).
• Add compatibility with Firefox 117.