Write 0.3.0 mobile app documentation

Update the OpenProject privacy policy with mobile app requirements

Create a smoke test list for each release and find ways to improve test coverage

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[Widgets] When opened from widget, time tracker needs to be closed multiple times before the user can access the app again

[Widgets] Notification widget doesn't always open the notification tab (sync issues)

[Widgets] Assigned to me widget opens with inprecise error message when user lacks permissions

[Widgets] Favorite project widget doesn't open the filtered by favourite view

[Widgets] Notifications widget on mobile app: read notifications are not cleared from the view after a long time

[Widgets] Time tracking widget is missing on some android phones