feat(docs): docs/を整理する #3062

Job	Run time
actionlint	14s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 33s
build-and-test-java-api (windows-latest)	6m 31s
build-and-test-python-api (windows-latest)	7m 40s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 35s
build-and-test-java-api (macos-latest)	4m 6s
build-windows-cpp-example	4m 22s
build-and-test-python-api (macos-latest)	3m 0s
build-and-test-java-api (ubuntu-latest)	2m 44s
build-and-test-python-api (ubuntu-latest)	3m 2s
c-header	45s
rust-integration-test-strategy-matrix	1s
rust-lint	2m 38s
rust-unit-test	3m 40s
shellcheck	14s
validate-cargo-lock	23s
rust-integration-test (macos-12)	2m 14s
rust-integration-test (ubuntu-20.04)	1m 23s
	46m 5s

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