Remove old deprecated Droen workflow

.drone.yml

@@ -1,35 +0,0 @@
----
-kind: pipeline
-name: 🐳 Docker
-
-steps:
-  - name: 📦 Image
-    image: plugins/kaniko
-    settings:
-      repo: r.mills.io/prologic/zs
-      tags: latest
-    when:
-      branch:
-        - main
-      event:
-        - push
-
----
-kind: pipeline
-name: 🥳 Done
-
-steps:
-  - name: 🔔 Notify
-    image: plugins/webhook
-    settings:
-      urls:
-        - https://msgbus.mills.io/ci.mills.io
-
-depends_on:
-  - 🐳 Docker
-
-trigger:
-  branch:
-    - main
-  event:
-    - push