Docs: Add sitemap support using `sphinx_sitemap` #564

Job	Run time
CheckLint	58s
GetMatrix	3s
BuildAndTest (macos-13, x86_64, 13)	54m 35s
BuildAndTest (macos-14, arm64, 14)	27m 6s
BuildAndTest (windows-latest)	1h 4m 20s
BuildAndTest (multipass-macos-12-x64, x86_64, 12)	31m 12s
BuildAndTest (macos-15, arm64, 15)	25m 13s
BuildAndTest (multipass-macos-12-arm, arm64, 12)	2h 2m 16s
CombineAndPublishMacOSPackage	1m 47s
DeleteSeparateMacPackages	5s
	5h 27m 35s

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