Migration page from "old" notifiers to "new" notifiers #4337

Job	Run time
build (stable, examples/counter)	1m 17s
build (stable, examples/marvel)	1m 5s
build (stable, examples/pub)	1m 22s
build (stable, examples/random_number)	1m 18s
build (stable, examples/stackoverflow)	1m 12s
build (stable, examples/todos)	1m 10s
build (stable, packages/riverpod)	2m 46s
build (stable, packages/riverpod/example)	1m 26s
build (stable, packages/flutter_riverpod)	1m 47s
build (stable, packages/flutter_riverpod/example)	1m 10s
build (stable, packages/hooks_riverpod)	1m 43s
build (stable, packages/hooks_riverpod/example)	2m 17s
build (stable, packages/riverpod_annotation)	1m 5s
build (stable, packages/riverpod_generator)	2m 4s
build (stable, packages/riverpod_generator/integration/build_yaml)	1m 38s
build (stable, website)	1m 5s
build (master, examples/counter)	1m 57s
build (master, examples/marvel)	1m 47s
build (master, examples/pub)	1m 36s
build (master, examples/random_number)	1m 27s
build (master, examples/stackoverflow)	1m 34s
build (master, examples/todos)	1m 55s
build (master, packages/riverpod)	4m 15s
build (master, packages/riverpod/example)	1m 39s
build (master, packages/flutter_riverpod)	1m 47s
build (master, packages/flutter_riverpod/example)	2m 32s
build (master, packages/hooks_riverpod)	1m 35s
build (master, packages/hooks_riverpod/example)	1m 46s
build (master, packages/riverpod_annotation)	1m 7s
build (master, packages/riverpod_generator)	1m 54s
build (master, packages/riverpod_generator/integration/build_yaml)	2m 4s
build (master, website)	1m 36s
	54m 56s

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