Added a button to complete reading the wikipedia article via the Wike App

[engalali9]

[nathandyer]

@ali-sameh-galal Thanks so much for this PR! This is almost ready to merge in, but I don't want to merge it until it it checks for Wike using Glib.AppInfo. Most folks that use Wike will have it installed from the flatpak (that's the primary way its distributed), and in that case /usr/bin/wike wouldn't exist. Plus, even for those that manually compile, it could be set to other paths depending on how you configure the build (installing to /usr/local/bin or ~/.local/bin is common).