feat: handle dead/drifted accounts on /account with sign-out and error page#32

Kzoeps wants to merge 3 commits intomainhypercerts-org/ePDS:mainfrom

karma/hyper-137-changing-email-address-on-epdshypercerts-org/ePDS:karma/hyper-137-changing-email-address-on-epdsCopy head branch name to clipboard