Implement new balance info design

- Center the balance info view.
- The explanation now pops-up just by clicking on the balance, instead of
  having an icon next to it. This makes the UI less cluttery.
- Set an onClickListener to the overdraft warning icon.
- Bring over the StartRecountDailyBudget prompt from the previous
  mainActivity to the ProgressFragment.
- Add a new, shorter, balance explanation.