Add how it works section to reviewer landing page #17689

Job	Run time
platform-unit-test (windows-latest)	7m 27s
compile	2m 19s
check-openrouter-api-key	2s
platform-unit-test (ubuntu-latest)	4m 15s
knip	53s
check-translations	33s
integration-test	3m 15s
	18m 44s

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