Remove config.js in favor of .env

[phyrog]

Makes it easier to inject build time options like the backend host by setting the REACT_APP_BACKEND_HOST environment variable. See ontohub/deployment#9.

[codecov]

Codecov Report

Merging #92 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #92   +/-   ##
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  Coverage   95.41%   95.41%           
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  Files          10       10           
  Lines         131      131           
  Branches       18       18           
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  Hits          125      125           
  Misses          5        5           
  Partials        1        1

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[codecov]

Codecov Report

Merging #92 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #92   +/-   ##
=======================================
  Coverage   95.41%   95.41%           
=======================================
  Files          10       10           
  Lines         131      131           
  Branches       18       18           
=======================================
  Hits          125      125           
  Misses          5        5           
  Partials        1        1

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4c5fda7...3861f29. Read the comment docs.

[eugenk]

I don't think that the backend version requirement should be part of the .env file. It is a requirement that the code makes, not one that the server makes. Maybe we should keep a config.js for things like this and have an additional .env file for things like the backend host address.

[phyrog]

I think a good solution would be to specify the backend version in the package.json file (custom fields are allowed), but importing the file (and all other files outside of src) is currently not allowed. There is a PR for that however that seems to be near completion.

[phyrog]

As a work-around for now, I can symlink package.json to src/config.json. Any downsides to symlinks in git?

[eugenk]

Since you are fixing the frontend-backend communication here, can you please add a request header Accept: application/json to every request that is made to the backend?

[eugenk]