[Docs] Move `Plugins` to `Reference` | `Python API` #5560

Job	Run time
compute-version	2s
build-docs / build-docs	3m 14s
build-artifacts / code-lint	51s
build-artifacts / frontend-build	8s
build-artifacts / runner-test (macos-latest)	56s
build-artifacts / runner-test (ubuntu-latest)	53s
build-artifacts / gateway-build	14s
build-artifacts / generate-json-schema	20s
build-artifacts / python-build	24s
build-artifacts / python-test (macos-latest, 3.10)	2m 8s
build-artifacts / python-test (macos-latest, 3.11)	2m 50s
build-artifacts / python-test (macos-latest, 3.13)	2m 20s
build-artifacts / python-test (macos-latest, 3.9)	2m 58s
build-artifacts / python-test (macos-latest, 3.12)	2m 38s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 8s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 44s
build-artifacts / python-test (ubuntu-latest, 3.12)	3m 49s
build-artifacts / python-test (windows-latest, 3.10)	1m 43s
build-artifacts / python-test (ubuntu-latest, 3.11)	3m 45s
build-artifacts / python-test (windows-latest, 3.12)	1m 52s
build-artifacts / python-test (windows-latest, 3.9)	1m 43s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 12s
build-artifacts / python-test (windows-latest, 3.11)	2m 53s
build-artifacts / python-test (windows-latest, 3.13)	2m 37s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	43s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	35s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	17s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	18s
	52m 15s

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