Rename imports to cnabio/cnab-to-oci

[silvin-lubecki]

[carolynvs]

When we moved porter over to a new import path, it helped to have canonical import paths defined in doc.go files, e.g.

doc.go

package remotes // import "github.com/cnabio/cnab-to-oci/remotes"

This helped us quickly tell while updating code when we had imported/vendored accidentally from the old location and the new location. Just a suggestion that may help downstream consumers of this lib when migrating.

[silvin-lubecki]

PTAL @carolynvs

[carolynvs]

Everything looks good, just one question. Should the /converter and /relocation packages get doc.go files with import statements as well?

[silvin-lubecki]

Thanks @carolynvs , just added the missing doc.go files + squashed.

[carolynvs]

LGTM 🦐 it

[silvin-lubecki]

Rebased