Support installation from GitLab and GitHub repositories

[azubieta]

Okay, for starters I think we need the cli app to work like the following, to make it more appealing for developers to adapt. Instead of go ahead and download the binaries from releases we can impose some kind of a single liner like npm packages. Something like this,

Run ShareMyHost using Appimage Installer,

 $ app run antony-jr@gh/ShareMyHost

To install AppImage Installer, (I guess we can use a URL shortner to make it appealing)

 $ bash < (curl -s https://raw.githubusercontent.com/azubieta/appimage-installer/master/install.sh)

Originally posted by @antony-jr in #27 (comment)