* Use the latest version of yarn to upgrade Polaris on the style guide
ShipIt comes with an old version of Yarn, that doesn't support integrity hashes. This means each polaris-styleguide PR coming from polaris-react deploys is deleting thousands of lines (hashes) from yarn.lock.
By leveraging the latest version of Yarn, we know those hashes will be kept in.
* Update UNRELEASED.md
* Use a strict version of Yarn
* Get the yarn version from dev.yml
Ran with the same command (`yarn dev`) this contains all the
functionality you know and love - hot reloading, a playground, percy
snapshots just with a different veneer
Tophatting is now done through the playground server instead of being a
separate thing. Examples are now hot reloadable - modifications to
README files and components will be reflected in your browser without
needing to save due to markdown files being imported via webpack loader.
This makes the examples part of the build pipeline instead of something
that gets serialised into the page. This makes individual pages smaller
at the expense of a larger bundle (which is shared amongst pages).
Update node-sass and fsevents to versions that have prebuild builds for
node v10 so we don't hav to compile ourselves
Fix issue in ToastManager.scss as a result of the updated version of
sass being stricter in how it handles custom properties.
* Standardize paths and yarn run notations
* Run the list of examples on Heroku
* Run webpack build in CI before running the server
* Use yarn run instead of yarn
