feat: add horizontal separators in README files for better readability #506

Job	Run time
test / run-e2e	2m 57s
test / node-modules-legacy-cache	23s
test / install-and-build	48s
test / run-jest-single	0s
test / run-jest-ts	23s
test / run-jest-cjs-legacy (8.x)	21s
test / run-jest-cjs-legacy (12.x)	21s
test / run-jest-cjs-legacy (10.x)	20s
test / run-jest-cjs-legacy (11.x)	21s
test / run-jest-cjs-legacy (7.x)	22s
test / run-jest-cjs-legacy (9.x)	25s
test / run-jest-cjs-legacy (13.x)	18s
test / run-jest-cjs (19.x)	26s
test / run-jest-esm (24.x)	20s
test / run-jest-cjs (21.x)	21s
test / run-jest-cjs (15.x)	21s
test / run-jest-cjs (16.x)	25s
test / run-jest-esm (20.x)	27s
test / run-jest-cjs (18.x)	21s
test / run-jest-cjs (23.x)	27s
test / run-jest-cjs (17.x)	27s
test / run-jest-cjs (20.x)	20s
test / run-jest-cjs (24.x)	24s
test / run-jest-esm (18.x)	27s
test / run-jest-esm (21.x)	23s
test / run-jest-esm (23.x)	27s
test / run-jest-cjs (22.x)	21s
test / run-jest-cjs (14.x)	27s
test / run-jest-esm (19.x)	24s
test / run-jest-esm (16.x)	27s
test / run-jest-esm (17.x)	25s
test / run-jest-esm (22.x)	21s
	15m 0s

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