Revert "CI add subkey docker image description and CI job to publish …

…it to the hub.docker.com (#13392)"

This reverts commit 53be987.

scripts/ci/gitlab/pipeline/publish.yml

@@ -49,19 +49,6 @@
     DOCKER_USER:                   $Docker_Hub_User_Parity
     DOCKER_PASS:                   $Docker_Hub_Pass_Parity
 
-.push-docker-image-description:
-  stage:                           publish
-  extends:
-    - .kubernetes-env
-    - .publish-refs
-  variables:
-    CI_IMAGE:                      paritytech/docker-description
-    DOCKERHUB_REPOSITORY:          parity/$PRODUCT
-    DOCKER_USERNAME:               $Docker_Hub_User_Parity
-    DOCKER_PASSWORD:               $Docker_Hub_Pass_Parity
-    README_FILEPATH:               $CI_PROJECT_DIR/scripts/ci/docker/$PRODUCT.Dockerfile.README.md
-  script:
-    - echo # Dummy command to satisfy GitLab CI linter.
 
 # publish image to docker.io/paritypr, (e.g. for later use in zombienet testing)
 .build-push-image-temporary:
@@ -103,14 +90,6 @@ publish-docker-subkey:
   variables:
     PRODUCT:                       subkey
 
-publish-docker-description-subkey:
-  extends:                         .push-docker-image-description
-  needs:
-    - job:                         build-subkey-linux
-  variables:
-    PRODUCT:                       subkey
-    SHORT_DESCRIPTION:             "The subkey program is a key management utility for Substrate-based blockchains."
-
 publish-s3-release:
   stage:                           publish
   extends: