ci: remove gitlab ci docs job #14

Job	Run time
ci-amd64 / check-dockerfile-modifications-with-last-commit	5s
ci-amd64 / check-dockerfile-modifications-with-base	3s
ci-amd64 / check-docker-artifact-existence	1s
ci-amd64 / compile-and-test-standard	3m 55s
ci-amd64 / build-image	0s
ci-amd64 / compile-and-test-local-custom-image	0s
ci-amd64 / analyze-coverage-report	21s
	4m 25s

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