docs: add 0.6 migration guide, link from README (#83) #287

Job	Run time
e2e	1m 54s
unit-test / lint	1m 34s
unit-test / test (ubuntu-latest, 26)	1m 58s
unit-test / test (windows-latest, 24)	3m 54s
unit-test / test (ubuntu-latest, 24)	1m 58s
unit-test / test (ubuntu-latest, 22)	1m 57s
unit-test / test (windows-latest, 26)	3m 55s
unit-test / test (windows-latest, 22)	4m 24s
	21m 34s

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