Replace the Ember config by a React config

[eugenk]

This allows us to deploy the react frontend. The ontohub-frontend repository is cloned to the local machine, the correct branch is checked out there and then it's built locally. We don't have any dependencies on the server for the frontend.

Unfortunately, we need to override some of the git tasks for this, but it's for a good cause.

[eugenk]

Do we want to deploy the .map files as well? If they are only for debugging purposes, I would rather omit them in the live version (ontohub.org) and only upload them to the development servers (staging.ontohub.org and develop.ontohub.org).

[phyrog]

I don't think there is any harm in uploading it for the live version too. They are only loaded when having the developer tools open, so no impact for normal users, but significantly improves debuggability if we need to debug the live version. Besides, the code is open source, so it's not like the sourcemaps reveal anything new.

Only impact is the harddrive space needed, which we should have plenty of.

[phyrog]

I think we should make some changes to the frontend to make it easier to inject config options during build (especially the backend host address). We're currently using the file src/config.js to set config values. Unless we're planning to add lots of build-time config options, it would probably be easier to use the .env files.

[eugenk]

Good point. My response in your PR applies here, too. This means that I need to add some code to this PR that changes the REACT_APP_BACKEND_HOST in the .env file to the address that the config/mixins/applications/*.rb file configures. Will do this after your PR is merged.

[phyrog]

Isn't it possible to just set an environment variable during building? Then you wouldn't need to change the .env file.

[eugenk]

Done with 56e3e57. I deployed the current frontend to https://staging.ontohub.org, but it indefinitely sends GetVersion and CurrentUser requests.

[eugenk]

This happens because the backend responded with an error:

{"errors":[{"message":"Field 'me' doesn't exist on type 'Query'","locations":[{"line":2,"column":3}],"fields":["query CurrentUser","me"]}]}

Updating the backend on staging fixed this.

[phyrog]

Can you open an issue in the frontend repo for this? Infinite loops should not happen...

[eugenk]

Done with ontohub/ontohub-frontend#94

[phyrog]