Remove GitLab CI deployment configuration

- Removes the automated deployment configuration.
- This configuration was unnecessary and potentially insecure.
- The deployment process will now be handled manually.

.gitlab-ci.yml

@@ -1,16 +0,0 @@
-image: alpine:latest
-
-deploy:
-  stage: deploy
-  before_script:
-    - 'command -v ssh-agent >/dev/null || ( apk add --update openssh )'
-    - eval $(ssh-agent -s)
-    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
-    - mkdir -p ~/.ssh
-    - chmod 700 ~/.ssh
-    - ssh-keyscan $SSH_HOST >> ~/.ssh/known_hosts
-    - chmod 644 ~/.ssh/known_hosts
-  script:
-    - ssh -p $SSH_PORT $SSH_USER@$SSH_HOST "cd repo && git stash && git pull --force origin master && ./build.sh"
-  only:
-    - master