Remove drone configuration.

__.drone.yml

@@ -1,19 +0,0 @@
-kind: pipeline
-name: default
-
-steps:
-  - name: build container
-    image: plugins/docker
-    settings:
-      dockerfile: Dockerfile
-      username:
-        from_secret: registry-username
-      password:
-        from_secret: registry-password
-      registry: https://cs-registry.ddnss.de
-      repo: cs-registry.ddnss.de/${DRONE_REPO_OWNER}/startup
-      dry_run: false
-      purge: true
-      insecure: false
-      tags:
-        - ${DRONE_TAG}