docs: make README bookmark internal links relative #2647

Job	Run time
wait	37s
wait2	57s
wait2-delay-120	2m 27s
wait2-delay-50	1m 22s
wait3	1m 25s
wait3-for-200-seconds	4m 26s
wait4	58s
wait-server-starts-after-100-seconds	2m 17s
ping-cli	7s
wait-multiple	1m 58s
wait-on-nextjs	22s
wait-on-vite	14s
wait-using-custom-command	38s
	17m 48s

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