feat(docs): generate gif for better doc integration #61

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	11s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	13s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	12s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	17s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	13s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	12s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	14s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	16s
test (1.21.x, _test.flappy)	31s
test (1.21.x, _test.pkg.amino)	1m 30s
test (1.21.x, _test.pkg.bft)	2m 26s
test (1.21.x, _test.pkg.others)	1m 31s
test (1.22.x, _test.flappy)	35s
test (1.22.x, _test.pkg.amino)	1m 30s
test (1.22.x, _test.pkg.bft)	21m 15s
test (1.22.x, _test.pkg.others)	1m 20s
upload-coverage	0s
	32m 26s

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