delete ci build

ci/concourse/build.yaml

@@ -1,24 +0,0 @@
-resources:
-  - name: content
-    type: git
-    source:
-      uri: https://xbib.org/gogs/joerg/content
-jobs:
-  - name: build
-    plan:
-      - get: content
-        trigger: true
-      - task: build
-        config:
-          platform: linux
-          image_resource:
-            type: docker-image
-            source:
-              repository: fl.hbz-nrw.de/centos-gradle
-          inputs:
-            - name: content
-          run:
-            dir: content
-            path: gradle
-            args:
-              - build