docs(proxy): clarify setupProxy.js usage to fix 404 error in CRA v5

[ginaseo]

What
Fixed a proxy issue in setupProxy.js where API requests were not forwarded to the target server (localhost:5000), resulting in a 404 error.

Changes
Replaced the app.use('/api', ...) pattern with pathFilter: '/api' in the proxy middleware configuration

Test
Confirmed that /api/... requests are correctly proxied to localhost:5000 using the following environment:

• react-scripts@5.0.1
• http-proxy-middleware@3.0.5

Reference
http-proxy-middleware official docs – Basic Usage

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