Enabled inserting and fetching "three positive things" in database

First version of the database created with only one table for “three
positive things”.
Merge branch 'development' into database
Refactoring, moved views to view package.
Added "three positive things" index card

Added "three positive things" index card.

Also added some new images for usage in list headers.
Merge branch 'index_step3' into development
Removed some temporary code.