Merge pull request #6 from edmoz/dev

New DataModel and variables.
refreshing UI and using Fira font
A few UI tweaks
A bit of refactoring to move the leaderboard onto the homepage as a widget
A bit more refactoring and adding more dummy text to the front page. Fixed leaderboard, sorta.
changed database schema
fix leaderboard with new completed_tasks array lenght
added the new user workflow
Merge pull request #7 from edmoz/fix-leaderboard

fix leaderboard with new completed_tasks array lenght