Bump node-sass to 5.0

[nrfox]

Bumps node-sass version to 5.0. Prior versions of node sass do not compile on systems without python2 due to this issue.

[jshaughn]

Seems fine, just a dev dependency. I guess what you are saying is that without this we required Python 2 to build?

[nrfox]

Seems fine, just a dev dependency. I guess what you are saying is that without this we required Python 2 to build?

Yes exactly. If you alias python=python3 you should see this same issue if you've got Python 2 on your system.

[israel-hdez]

I invoked

yarn && yarn build && yarn start

It works. As long as it works, I'm happy :-)

[jshaughn]

@nrfox You can merge this, as just a change to dev deps it does not require QE.