fix: add simplified manual PyPI publish workflow and setup guide #132

Job	Run time
integration-test (3.11)	6m 6s
integration-test (3.10)	5m 11s
integration-test (3.12)	6m 30s
test (3.10)	32s
test (3.12)	32s
test (3.11)	29s
integration-test-fork-feedback	0s
build	24s
	19m 44s

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