Unlink Firefox Account

[sandysage]

When I'm done with Firefox Lockbox, and want to remove the app, I want to ensure that my login data is also removed from the app.

When unlinking my account for Lockbox, I should be given a confirmation dialog to ensure that I want to complete the action of blowing away my data on my device.

Acceptance criteria

• Should destroy local Lockbox data, including:
  • settings
  • stored FxA information
  • datastore information
• Should confirm the user truly wants to remove the Firefox Account and all the associated data.
• Should convey that unlinking an account renders the Lockbox app useless until login (eg it’s effectively a reset button)

Visual Design

InVision
https://mozilla.invisionapp.com/share/3SN35UHWJDX#/309979893_Account_-_Confirm_Disconnect

Zeplin
https://zpl.io/25qK4xQ

Visual Design

InVision
Account Screen: https://mozilla.invisionapp.com/share/3SN35UHWJDX#/309979892_Account
Confirm Unlink: https://mozilla.invisionapp.com/share/3SN35UHWJDX#/309979893_Account_-_Confirm_Disconnect

Zeplin
Account Screen: https://zpl.io/beYM3Wz
Confirm Unlink: https://zpl.io/25qK4xQ

Depends on #11