redirect from http to https, www to non-www etc

[amitu]

For http users to go to https by:

-- import: fastn
-- fastn.package: foo.com
main: true
redirect-to-https: true

This field is only allowed for main: true packages.

[amitu]

We can also do:

-- import: fastn
-- fastn.package: foo.com
main: true
redirect-to-www: true

Redirect foo.com traffic to www.foo.com, or to do the reverse:

-- import: fastn
-- fastn.package: foo.com
main: true
strip-www: true