Add Ability to use base URL via PUBLIC_URL environment variable

[theminor]

Per discussion on gitter - the simplest solution was simply adding a reference to the PUBLIC_URL environment variable in the Router object. Also added basic instructions to deploy if anyone wants to do so. My understanding is that this shouldn't affect non-production environments..

[DanielDe]

Awesome, thanks @theminor! Do you know if PUBLIC_URL has a default value? I'm interested in what happens with <Router basename={${process.env.PUBLIC_URL}}> if PUBLIC_URL isn't set.

[theminor]

@DanielDe from what I've read, <Router basename=...> will have no effect if PUBLIC_URL is null. It will also only apply for production builds - that is, you have to compile i.e. with serve -s build or similar - and then serve the compiled version.

All that said, I'm having problems getting the Google Authentication working. I have the API all set up and it seems to authenticate (asks for permissions, etc.), but there must be an issue with the redirect after authentication. I have the redirect pointing to https://mydomain.com/org-web but when the redirect back to mydomain happens, I get errors.

I haven't tried dropbox yet, but it might have the same issue. I'm still trying to find where the problem is...

[DanielDe]

Ah, hey, sorry for the slow reply here @theminor.

What error are you getting with GDrive? If you haven't done so already, you'll need to specify the redirect URIs in the Google Cloud console.