Metadata cleanup of main repo

Since fdroidserver#490 is not fixed and there's no automatic process to clean up, we can use manual actions as needed (hopefully not that often)

So, first action was fdroid-website#672 (comment 1293875964) by @eighthave

Now, I've randomly seen a mix-up for Neo Store, has a bunch of old screenshotsof its upstream Droid-ify :) so I think we can go to com.machiav3lli.fdroid/en-US/phoneScreenshots and delete app-*.png and home-*.png

Reading fdroiddata#2842 (closed) while the old screenshots are gone they were just replaced with the one pixel wide white images, so in com.vincent_falzon.discreetlauncher/en-US/phoneScreenshots better delete ?.png