Improve development setup for embed #33
Description
The embed currently requires changing a hard-coded embedAppOrigin variable in the demo/index.html page based on whether we are running locally or deploying to production.
Additionally, the developer needs to manually cd into the /demo directory and run a web server to serve this demo host index html page and subsequently run another process to serve up the elm embed application on a separate port.
Additionally, the developer needs to have elm already installed.
Lastly, the node version is not pinned down.
This all seems a little annoying / cumbersome.
Desired Outcome:
- There should be just one command to do all this work for a developer, namely npm install
- There should be environment variables set in demo/index.html so that we don't have to hardcode values and not have an error prone deployment process