Update index.md
Update index.md

Updated instructions to use yarn and new form instead of old component wrapper form
storybooks/storybook,storybooks/storybook,storybooks/storybook,rhalff/storybook,rhalff/storybook,storybooks/storybook,storybooks/storybook,rhalff/storybook,rhalff/storybook,rhalff/storybook,storybooks/react-storybook,kadirahq/react-storybook,storybooks/react-storybook,rhalff/storybook,storybooks/react-storybook,storybooks/react-storybook,storybooks/storybook,kadirahq/react-storybook,storybooks/storybook