fix adding new account in macos
Fix mailsync ping command
Fix mutt-wizard
Fix muttrc for mac
Add files for offlineimap_profile and offlineimap_header
Update README with MacOS install instructions
`dialog`, `neomutt` and `offlineimap` should be installed. You also need to have a GPG public/private key pair for the wizard to automatically store your passwords. The whole repo should be cloned to `~/.config/mutt/`. (If you have a previous mutt folder, you'll want to back it up or delete it first.)