* feat(stacks): add the ability to migrate stacks to another endpoint
* feat(stack-details): do not redirect to alternate endpoint after migration
* fix(api): fix merge conflicts
* feat(stack-details): add a modal to confirm stack migration
* chore(build-system): drop bower, use npm|yarn for frontend dependencies
* chore(build-sytem): for github dependencies, use semver format instead of tag/commit
* add yarn.lock