Reorder accounts in the sidebar

[kieranroneill]

Summary

Users with a lot of accounts would like the ability to re-order the accounts.

Acceptance criteria

Scenario 1: Re-order accounts
GIVEN a User has more than one account
WHEN the User drags the first account
AND moves it to the bottom
THEN the accounts are re-ordered

Notes

• This must persist in storage.
• Use https://www.npmjs.com/package/react-dnd