updated readme to link to correct initial_viewports location
updated readme to link to correct initial_viewports location

just moving from .js -> .ts
storybooks/react-storybook,storybooks/storybook,storybooks/storybook,storybooks/storybook,storybooks/react-storybook,kadirahq/react-storybook,storybooks/react-storybook,storybooks/react-storybook,storybooks/storybook,storybooks/storybook,storybooks/storybook,storybooks/storybook,kadirahq/react-storybook