Refactor GitLab CI stages and fix example IP address in CfDnsClient documentation

.gitlab-ci.yml

@@ -80,7 +80,7 @@ javadoc:
     - |
       if ! git diff --quiet -- docs/apidocs; then
         git add docs/apidocs
-        git commit -m "Update Javadocs"
+        git commit -m "Update Javadocs [skip ci]"
         git push https://${GITLAB_USERNAME}:${CI_PUSH_TOKEN}@gitlab.com/th-schwarz/CloudflareDNS-java.git ${CI_COMMIT_REF_NAME}
         echo "Commits found and pushed"
         mkdir public