Provide a link to the app center

[waldyrious]

The elementaryOS project decided a while ago to migrate away from about dialogs, but that makes it cumbersome to get information about the app (e.g. website, contact information or issue tracker) from the app itself.

I think a good middle ground could be to provide an appcenter link in the app's right click menu (or an icon in the headerbar).

That way the information remains centralized, but the user wouldn't have to manually open the AppCenter, and search for the app's name before they can access that info. (This is essentially what /u/casiopopasio suggested in this reddit comment.)