Easier configuration of DokkaPublication output directory #938

Job	Run time
tests / site-check / ./gradlew docusaurusBuild --stacktrace @ ubuntu-latest	2m 10s
tests / gradle-check (macos-latest, check --continue) / ./gradlew check --continue --stacktrace @ macos-latest	2m 14s
tests / gradle-check (ubuntu-latest, check --continue) / ./gradlew check --continue --stacktrace @ ubuntu-latest	2m 9s
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	1m 51s
	8m 24s

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