Remove --dev option from yarn install command
Remove --dev option from yarn install command

For yarn, adding a `--dev` flag adds this dependency to `devDependencies`.  Since this dependency is for authentication to be used in a production environment eventually, I think we want to add this as a regular dependency, which is what `yarn add` will do.
yvonnewilson/docs,jeffreylees/docs,auth0/docs,jeffreylees/docs,auth0/docs,auth0/docs,yvonnewilson/docs,jeffreylees/docs,yvonnewilson/docs