Updates CrowdIn configuration to use /docs/lang/folder/file.md

[ericnakagawa]

This PR changes where localized files, downloaded from CrowdIn, are output.

To verify you can run crowdin upload and download locally from reacjs.org folder:

crowdin --config crowdin.yaml upload sources --auto-update -b test-17
crowdin --config crowdin.yaml download -b test-17

The files will then be available in reactjs.org/docs/*.

[reactjs-bot]

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[bvaughn]

Thanks Eric.

[bvaughn]

cc @clemmy We'll want to merge this into our crowdin integration branch.

[clemmy]

Yup, we can probably just merge master in. I'll submit a PR.

[clemmy]

@ericnakagawa I built and downloaded the translation zip, and I see 3 folders after extracting: master, test-16, and test-17. Looking at the contents of each one: master looks recursive, which isn't what we want, and the contents of test-17 seem to be more aligned with what I was expecting, but it only has blog and docs folder underneath a locale directory. (Also the contents are in English). Is this what is expected, or am I doing something wrong?

[clemmy]