doc: add tips for Debian and KDE (#6225)
doc: add tips for Debian and KDE (#6225)

* [libappindicator: deprecated in Debian](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895037)
* `gconf2` and `gconf-service` useless for KDE, package is for legacy applications and no longer used by GNOME.
loopline-systems/electron-builder,loopline-systems/electron-builder,loopline-systems/electron-builder,loopline-systems/electron-builder,electron-userland/electron-builder,loopline-systems/electron-builder,electron-userland/electron-builder,electron-userland/electron-builder