Visual Import docs needs updated

[smithrobs]

Problem description

We've recently moved/updated Visual Import. As a result some of the docs here are outdated:

• https://www.pulumi.com/docs/insights/import/ -- Visual Import has moved to Stacks
• https://www.pulumi.com/docs/iac/adopting-pulumi/import/ -- does not mention Visual Import. You need to notice and navigate to "Using Visual Import"