feat(docs): generate gif for better doc integration #52

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	13s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	13s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	14s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	15s
test (1.21.x, _test.flappy)	33s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	9s
test (1.21.x, _test.pkg.amino)	1m 34s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	9s
test (1.21.x, _test.pkg.bft)	4m 5s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	20s
test (1.21.x, _test.pkg.others)	1m 22s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	11s
test (1.22.x, _test.flappy)	32s
test (1.22.x, _test.pkg.amino)	1m 33s
test (1.22.x, _test.pkg.bft)	2m 18s
test (1.22.x, _test.pkg.others)	1m 27s
upload-coverage	1s
	15m 9s

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