fix: docs/package.json to reduce vulnerabilities
fix: docs/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:deep-extend:20180409
- https://snyk.io/vuln/npm:lodash:20180130

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