Add KDE Store avatar and profile links to AboutPage
With the introduction of the direct-link avatar endpoint on the KDE Store, we are finally able to make use of the ocsUsername information. We were able to also do this for profile links in the past, but with the avatar endpoint there, we can now do both of them.
Also further fixes a couple of warnings when using the data structure described in the AboutPage's documentation (rather than a KAboutData instance)
Without this change:
With this change: