feat(docs): generate gif for better doc integration #69

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	27s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	27s
test (1.21.x, _test.cmd)	1m 32s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	29s
test (1.21.x, _test.pkg)	50s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	27s
test (1.21.x, _test.gnolang.native)	30s
test (1.21.x, _test.gnolang.stdlibs)	57s
test (1.21.x, _test.gnolang.realm)	34s
test (1.21.x, _test.gnolang.pkg0)	2m 2s
test (1.21.x, _test.gnolang.pkg1)	6m 38s
test (1.21.x, _test.gnolang.pkg2)	4m 10s
test (1.21.x, _test.gnolang.other)	28s
test (1.22.x, _test.cmd)	1m 34s
test (1.22.x, _test.pkg)	1m 20s
test (1.22.x, _test.gnolang.native)	39s
test (1.22.x, _test.gnolang.stdlibs)	1m 1s
test (1.22.x, _test.gnolang.realm)	50s
test (1.22.x, _test.gnolang.pkg0)	2m 4s
test (1.22.x, _test.gnolang.pkg1)	6m 35s
test (1.22.x, _test.gnolang.pkg2)	4m 12s
test (1.22.x, _test.gnolang.other)	35s
upload-coverage	13s
	38m 34s

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