Delete preview as it does not work anyway

.gitlab-ci.yml

-image: node:8
+image: node:12
 
-stages:
-  - preview
-  - deployment
-
-# env vars:
-# - PREVIEW_SSH_KEY
-preview:
-  stage: preview
-  variables:
-    HTML_DIR: "/var/www/html/preview.ok1kvk.cz"
-    SSH_HOST: "preview-ok1kvk-cz@alfa.ok1kvk.cz"
-  environment: 
-    name: preview/$CI_BUILD_REF_NAME
-    url: https://preview.ok1kvk.cz/$CI_BUILD_REF_NAME
-    on_stop: stop_preview
-  except:
-    - master
-  script:
-    - node --version
-    - rm -rf build
-    - mkdir -p fake_static
-    - npm ci
-    - node ./index.js --baseurl /$CI_BUILD_REF_NAME --contentdir . --staticdir fake_static --themedir theme --builddir build --noserver
-    - echo "$PREVIEW_SSH_KEY" > sshkey
-    - chmod 600 sshkey
-    - rsync -e 'ssh -i sshkey' -rc --delete build/ $SSH_HOST:$HTML_DIR/$CI_BUILD_REF_NAME/
-    - ssh -i sshkey $SSH_HOST git -C $HTML_DIR/static/static/ pull
-    - ssh -i sshkey $SSH_HOST cp -asf $HTML_DIR/static/static/articles/. $HTML_DIR/$CI_BUILD_REF_NAME/clanek/
-    - ssh -i sshkey $SSH_HOST ln -sf $HTML_DIR/static/static/images/ $HTML_DIR/$CI_BUILD_REF_NAME/
-    - rm sshkey
-
-stop_preview:
-  stage: preview
-  variables:
-    HTML_DIR: "/var/www/html/preview.ok1kvk.cz"
-    SSH_HOST: "preview-ok1kvk-cz@alfa.ok1kvk.cz"
-  script:
-    - echo "$PREVIEW_SSH_KEY" > sshkey
-    - chmod 600 sshkey
-    - ssh -i sshkey $SSH_HOST "rm -rf $HTML_DIR/$CI_BUILD_REF_NAME/"
-    - rm sshkey
-  when: manual
-  environment:
-    name: preview/$CI_BUILD_REF_NAME
-    action: stop
-  except:
-    - master
-    
 # Needs following env vars:
 # - LFTP_PASSWORD
 # - DEPLOY_SSH_KEY
 deploy:
   tags:
     - docker
-  stage: deployment
   environment: deployment
   variables:
     HTML_DIR: "/html/www"