Add deprecated addons warning to MIGRATION.md
Add deprecated addons warning to MIGRATION.md

storybooks/storybook,storybooks/storybook,storybooks/react-storybook,kadirahq/react-storybook,kadirahq/react-storybook,storybooks/react-storybook,storybooks/storybook,storybooks/storybook,storybooks/react-storybook,storybooks/storybook,storybooks/react-storybook,storybooks/storybook,storybooks/storybook