ci: remove old GitLab CI config as we now use Forgejo Actions

.gitlab-ci.yml

@@ -1,38 +0,0 @@
-variables:
-  TZ: Europe/Berlin
-
-stages:
-  - build
-  - deploy
-
-build-website:
-  stage: build
-  image: registry.gitlab.com/pages/hugo/hugo_extended:latest
-  before_script:
-    - apk update
-    - apk add tzdata coreutils curl jq git
-  script:
-    - ./fetch-calendar.sh
-    - sed -i "s#baseURL = 'https://hamburg.ccc.de/'#baseURL = 'https://next.hamburg.ccc.de/'#" hugo.toml
-    - hugo
-  artifacts:
-    untracked: true
-    expose_as: "website build"
-    name: "website-build-$CI_COMMIT_REF_NAME-$CI_COMMIT_SHORT_SHA"
-    paths:
-      - public/
-    expire_in: 1 hrs
-
-deploy-website:
-  stage: deploy
-  image: alpine
-  before_script:
-    - apk update
-    - apk add rsync openssh
-  script:
-    - chmod 400 $NEXT_SSH_DEPLOY_KEY
-    - rsync -r --delete -e "ssh -i $NEXT_SSH_DEPLOY_KEY -o 'UserKnownHostsFile $SSH_KNOWN_HOSTS_FILE'" public/ ccchh-website-deploy@public-web-static-intern.hamburg.ccc.de:/var/www/next.hamburg.ccc.de/
-  rules:
-    - if: $CI_COMMIT_BRANCH == "main"
-      when: on_success
-    - when: never