Figure out chromatic config to get it back into CI

https://circleci.com/gh/influxdata/giraffe/391
```yarn run v1.19.1
$ chromatic test
Chromatic Tester: Detected 'storybook' script, running with inferred options:
--script-name=storybook --storybook-port=50000
Override any of the above if they were inferred incorrectly.

Chromatic Tester: Starting storybook
**Chromatic build failed. Please note the session id: '4a22b4a4-cb93-43c8-8ae7-1ae490faa345' and contact support@hichroma.com -or- open a support ticket at https://chromaticqa.com**

Error: No server responding at http://localhost:50000/iframe.html within 300 seconds.
at Timeout. (/home/circleci/repo/stories/node_modules/storybook-chromatic/dist/tester.js:1:8835)
at tryCatch (/home/circleci/repo/node_modules/@babel/runtime/node_modules/regenerator-runtime/runtime.js:45:40)
at Generator.invoke [as _invoke] (/home/circleci/repo/node_modules/@babel/runtime/node_modules/regenerator-runtime/runtime.js:271:22)
at Generator.prototype. [as next] (/home/circleci/repo/node_modules/@babel/runtime/node_modules/regenerator-runtime/runtime.js:97:21)
at asyncGeneratorStep (/home/circleci/repo/node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:24)
at _next (/home/circleci/repo/node_modules/@babel/runtime/helpers/asyncToGenerator.js:25:9)
at /home/circleci/repo/node_modules/@babel/runtime/helpers/asyncToGenerator.js:32:7
at new Promise ()
at Timeout. (/home/circleci/repo/node_modules/@babel/runtime/helpers/asyncToGenerator.js:21:12)
at Timeout.i [as _onTimeout] (/home/circleci/repo/stories/node_modules/storybook-chromatic/dist/tester.js:1:8652)

error Command failed with exit code 255.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Exited with code exit status 255
```

Start with the linked CircleCI run and the `chromatic test` command, including its inferred Storybook options and timeout at `/iframe.html`. Trace the project’s Storybook and Chromatic CI configuration; done means the Storybook server responds in CI and the Chromatic step completes successfully.

Written by the indexing model from the issue text.