Removing remained files

otterdog_database/docker/otterdog_etl/env

-#### Environment variables for the container
-
-ETL_SLEEPTIME=1800
-
-MONGODB_CLOUD_USERNAME="dummy" ### Please, take the credentials from Bitwarde
-MONGODB_CLOUD_PASSWORD="dummy"  ### Please, take the credentials from Bitwarde
-MONGODB_CLOUD_DB="dummy_db" ### Please, take the data from Bitwarden
-MONGODB_CLOUD_COLLECTION="dummy_collection" ### Please, take the data from Bitwarden
-DATA_PATH="/output"
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