Adjust Proxy Paths

[mxosman]

Description of the change

Adjusts the path in the setupProxy.js to ["/api", "/app_public_config.js"] as that seems to fix some strange issue with proxying and connecting to the backend.

Related issues

Closes #XXXX

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[lilidworkin]

Amazing! I'm going to let @nichelle-hall test this and then accept if it works for her!

[nichelle-hall]

LGTM! Tested locally and it worked for me :)