fix(docs): stop sitemap listing the homepage twice #12978

Job	Run time
call_is_mergeable / Check if branch is mergeable	7s
build-dev-test (3.11, true)	8m 17s
build-dev-test (3.12, true)	9m 10s
build-dev-test (3.11, false)	9m 27s
build-dev-test (3.10, true)	8m 8s
build-dev-test (3.12, false)	8m 58s
build-dev-test (3.10, false)	9m 2s
	53m 9s

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