message: docs: update storybook readme
diff: ## @superset-ui/demo
  -[![Version](https://img.shields.io/npm/v/@superset-ui/demo.svg?style=flat)](https://img.shields.io/npm/v/@superset-ui/demo.svg?style=flat)
  [![David (path)](https://img.shields.io/david/apache-superset/superset-ui-plugins.svg?path=packages%2Fsuperset-ui-demo&style=flat-square)](https://david-dm.org/apache-superset/superset-ui-plugins?path=packages/superset-ui-demo)
  -Storybook of `@superset-ui` packages. See it live at
  -[apache-superset.github.io/superset-ui](https://apache-superset.github.io/superset-ui)
  +Storybook of `@superset-ui-plugins` packages. See it live at
  +[apache-superset.github.io/superset-ui-plugins](https://apache-superset.github.io/superset-ui-plugins)
  ### Development
  @@ -12,12 +11,10 @@ Storybook of `@superset-ui` packages. See it live at
  To view the storybook locally, you should:
  -1. Clone the [superset-ui](https://github.com/apache-superset/superset-ui) monorepo.
  -2. Run `yarn install && yarn run bootstrap` in the `superset-ui` root directory. This will install all dependencies for this package and sym-link any `@superset-ui` packages to your local system.
  -3. Clone [superset-ui-plugins](https://github.com/apache-superset/superset-ui-plugins) repo.
  -4. Run `yarn install && yarn build` in the `superset-ui-plugins` root directory.
  -5. Change to the demo directory `cd packages/superset-ui-plugins-demo`.
  -6. Run `yarn run storybook`. This will open up a dev server at http://localhost:9001.
  +1. Clone [superset-ui-plugins](https://github.com/apache-superset/superset-ui-plugins) repo.
  +2. Run `yarn install && yarn build` in the `superset-ui-plugins` root directory.
  +3. Change to the demo directory `cd packages/superset-ui-plugins-demo`.
  +4. Run `yarn run storybook`. This will open up a dev server at http://localhost:9001.
  #### Adding new stories
  @@ -30,8 +27,8 @@ exported for that package in the `storybook/stories/<package>/index.js` file.
  If you are creating stories for a package that doesn't yet have any stories, follow these steps:
  -1. Add any new package dependencies (including any `@superset-ui/*` packages) via
  - `yarn add <package>`.
  +1. Add any new package dependencies via
  + `yarn add <package>`, but if it is `@superset-ui/*` packages, manually add it to `peerDependencies`.
  2. Create a new folder that mirrors the package name
  