Whiteboard app store release

[juliusknorr]

• Proper screenshots and add to info.xml
• Set categories
• Update description
• Add to relevant app bundles
• Mark as featured (ping Jan?)
• Notification to recommend app
• Documentation

[jancborchardt]

@juliushaertl let me know when the app store release is done and I can mark it as featured.

I would also remove the 2 existing comments since they are about the other previous whiteboard app which is completely different. Just noting it here for the record.

[juliusknorr]

@jancborchardt Pre-release is on the app store, so could be marked as featured. Did this as a dry run for the release process, final will be there for Saturday.

[jancborchardt]

• App is featured
• Description was changed to from "Whiteboard app" to "Create & collaborate on an infinite canvas!" as that shows presently in the app lists on the store, FYI @juliushaertl in case it needs adjustment in the info.xml or elsewhere. (Already updated the Github repo description)
• Past comments/ratings deleted cause they are unrelated to this new app as mentioned