docs: split responses usage guide into sub-pages #7434

Job	Run time
mypy	40s
validate	14s
pyright	30s
slotscheck	17s
Test server integration (uvicorn<0.27.0)	49s
test_typing_extensions (4.13.1)	22s
Test server integration (uvicorn>=0.27.0)	47s
test_typing_extensions (4.14.0)	22s
test_typing_extensions (latest)	24s
test_typing_extensions (4.12.1)	24s
test (3.11) / test	2m 26s
Test Minimal Application with Base Dependencies	21s
test (3.13) / test	2m 36s
test (3.12) / test	2m 46s
test (3.14) / test	2m 0s
test-platform-compat	-1s
build-docs	2m 56s
test_success	4s
upload-test-coverage	18s
	18m 15s

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