refactor: remover todas as dependências do GitLab no workshop

- Aula 08: nginx-ingress TCP passthrough gitlab→gitea, comments
- Aula 09: add-client.sh API GitLab→Gitea
- Aula 11: node-bugado deployment image registry.kube.quest→gitea.kube.quest
- Aula 12: setup.sh/cleanup.sh API GitLab→Gitea, ArgoCD repoURL
- Aula 13: k8s manifests, benchmarks: registry.kube.quest→gitea.kube.quest,
           gitlab-registry→gitea-registry, GITLAB_TOKEN→GITEA_TOKEN
- Aula 14: comments GitLab→Gitea
- README raiz: arquitetura, tabela, DNS

aula-13/images/devops-toolbox/.gitlab-ci.yml

@@ -9,7 +9,7 @@ stages:
   - push
 
 variables:
-  REGISTRY: registry.kube.quest
+  REGISTRY: gitea.kube.quest
   IMAGE_NAME: factory/devops-toolbox
   DOCKER_HOST: tcp://docker:2376
   DOCKER_TLS_CERTDIR: "/certs"