chore: add docs and example for multi region stacks #303
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This adds some docs on multi stack setup. The only scenario where you maybe should use multiple stacks is when you are deploying to multiple regions since stack is the most granular level you can configure the environment.
As part of this PR i've also added an example test that uses CloudFront and Lambda@Edge since that is a common scenario where users would need to deploy resources to multiple regions. The test is skipped because Lambda@Edge resources cannot be easily cleaned up (they are removed from all AWS regions in the background).