Add option for automatically aggregating HTML projects #820

Job	Run time
tests / site-check / ./gradlew docusaurusBuild --stacktrace @ ubuntu-latest	2m 41s
tests / gradle-check (macos-latest, check --continue) / ./gradlew check --continue --stacktrace @ macos-latest	16m 25s
tests / gradle-check (windows-latest, check --continue -x :modules:dokkatoo-plugin-integration-tests:chec... / ./gradlew check --continue -x :modules:dokkatoo-plugin-integration-tests:check -x :modules:dokkatoo-plugin:testFunctional --no-parallel --no-configuration-cache --no-daemon --max-workers=1 --stacktrace @ windows-latest	3m 29s
tests / gradle-check (ubuntu-latest, check --continue) / ./gradlew check --continue --stacktrace @ ubuntu-latest	18m 21s
	40m 56s

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