Ux email app bugs left

- [\#829078](https://bugzilla.mozilla.org/show_bug.cgi?id=829078) - [email] adjust and remove some styles in *.css of email
- [\#844995](https://bugzilla.mozilla.org/show_bug.cgi?id=844995) - Setting up new email account screen updates
- [\#844973](https://bugzilla.mozilla.org/show_bug.cgi?id=844973) - New Account Screen - Layout and Type updates
- [\#845048](https://bugzilla.mozilla.org/show_bug.cgi?id=845048) - Email screen type and layout updates