feat(docs): docs/を整理する #3053

Job	Run time
build-windows-cpp-example	4m 29s
rust-integration-test-strategy-matrix	1s
actionlint	21s
rust-lint	3m 42s
rust-unit-test	6m 14s
shellcheck	9s
validate-cargo-lock	20s
build-and-test-java-api (windows-latest)	6m 38s
build-and-test-python-api (windows-latest)	6m 55s
build-and-test-python-api (macos-latest)	5m 5s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 56s
build-and-test-java-api (macos-latest)	2m 33s
build-and-test-python-api (ubuntu-latest)	3m 1s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 32s
build-and-test-java-api (ubuntu-latest)	2m 42s
c-header	44s
rust-integration-test (macos-12)	2m 18s
rust-integration-test (ubuntu-20.04)	4m 2s
	52m 42s

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