Rearchitect flow

[taoeffect]

Ideally, this is how it should work:

1. Select desired functionality (ex: send mail, receive mail, webmail, migration, etc.)
2. For each functionality, select desired implementation (ex: postfix vs exim, dspam vs spamassassin, mailpile vs roundcube, etc.)
3. For each implementation, select desired options and dependencies (ex: backend for email from [sqlite, mariadb, pqsql, etc.]; for migration [enter emails/passwds]; for basics [email accounts & passwords]; etc.)

Click Go in some interface.

cc @PiPeep

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[taoeffect]

lol, nice tag @pipeep.