fix eslint: remove unused plugin-promise, ignore .docu, fix lint errors #658

Job	Run time
check-and-lint	14s
adapter-tests (20.x, windows-latest)	13s
adapter-tests (22.x, windows-latest)	4s
adapter-tests (22.x, macos-latest)	9s
adapter-tests (20.x, ubuntu-latest)	6s
adapter-tests (20.x, macos-latest)	8s
adapter-tests (24.x, ubuntu-latest)	11s
adapter-tests (22.x, ubuntu-latest)	10s
adapter-tests (24.x, windows-latest)	14s
adapter-tests (24.x, macos-latest)	8s
deploy	0s
	1m 37s

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