Migrate the landing page to React (keep docs & blog on MkDocs) #7305

Job	Run time
compute-version	3s
build-docs / build-docs	3m 6s
build-artifacts / gateway-build	13s
build-artifacts / code-lint	56s
build-artifacts / runner-test	1m 7s
build-artifacts / frontend-build	9s
build-artifacts / python-build	21s
build-artifacts / generate-json-schema	23s
build-artifacts / python-test (macos-latest, 3.13)	3m 33s
build-artifacts / python-test (macos-latest, 3.11)	2m 36s
build-artifacts / python-test (macos-latest, 3.12)	3m 40s
build-artifacts / python-test (windows-latest, 3.12)	2m 24s
build-artifacts / python-test (windows-latest, 3.13)	1m 59s
build-artifacts / python-test (ubuntu-latest, 3.13)	5m 22s
build-artifacts / python-test (windows-latest, 3.11)	2m 57s
build-artifacts / python-test (ubuntu-latest, 3.10)	6m 2s
build-artifacts / python-test (macos-latest, 3.10)	2m 47s
build-artifacts / python-test (ubuntu-latest, 3.12)	5m 44s
build-artifacts / python-test (windows-latest, 3.10)	1m 56s
build-artifacts / python-test (ubuntu-latest, 3.11)	5m 47s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	25s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	29s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	17s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	20s
	52m 36s

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