Allow devserver to be served from any host

[chandlerprall]

Summary

Tells the webpack dev server to accept connections to any host name. This allows remote machines (and VMs) to connect by IP address without ngrok or similar.

Checklist

- [ ] This was checked in mobile
- [ ] This was checked in IE11
- [ ] This was checked in dark mode
- [ ] Any props added have proper autodocs
- [ ] Documentation examples were added
- [ ] A changelog entry exists and is marked appropriately
- [ ] This was checked for breaking changes and labeled appropriately
- [ ] Jest tests were updated or added to match the most common scenarios
- [ ] This was checked against keyboard-only and screenreader scenarios

[snide]

I'm likely a poor reviewer of this, but I at least read the docs to see how this works. Assume there isn't any silly security bit we should be aware of here, since this is just for local dev?

[chandlerprall]

Assume there isn't any silly security bit we should be aware of here, since this is just for local dev?

Correct, because this is for local dev. Technically it is opening up the dev server to a [potential] broader connection, but so many other things are still in play both physically and through obscurity that there isn't a practical implication.