Remove Storybook (#4397)

.dockerignore

.nanoignore

.slugignore

package.json

storybook/config.js

storybook/initial_state.js

storybook/stories/autosuggest_textarea.story.js

storybook/stories/button.story.js

storybook/stories/character_counter.story.js

storybook/stories/loading_indicator.story.js

storybook/stories/onboarding_modal.story.js

storybook/storybook.scss

storybook/webpack.config.js

yarn.lock