Zero state for history panel

[#62]
Style zero state for history panel
Closes issue #62

Amended the copy slightly
Do not repeat transaction history header

[fixes #62]
On enter email & send amount submit form
When initializing the view preferred currency from the db, do write back to the db
Redirect http traffic to https in production

[Fixes #61]
Remove mnemonic & address from settings

[#67]
Remove passphrase one-by-one screen

[#66]
Storing the mnemonic in the wallet closure is unnecessary

[#64]
Center auth module + add footer partials
Amend footer copy and hyperlinks
Remove noselect from passphrase
Fix auth button margins
Tidy up passphrase review state
Resize header logo
Refactor footer for PIN entry
setup widget for currency-overlay
move all overlays outside of frame
migrate code from settings -> send -> currency-overlay