feat(blog): Support GitLab

[thien-do]

Some quick notes:

Namespace:

• https://github.com/gitlabhq/gitlabhq

API:

• https://docs.gitlab.com/ee/api/repository_files.html#get-file-from-repository
• https://gitlab.com/api/v4/projects/gitlab-org%2Fgitlab/repository/files/README.md?ref=master
• https://gitlab.com/api/v4/projects/gitlab-org%2Fgitlab/repository/tree

Tests:

• https://gitlab.com/gitlab-com/gl-infra/scalability/-/tree/master/doc
• https://gitlab.com/gitlab-com/gl-infra/ci-runners/deployer
• https://gitlab.com/gitlab-org/gitlab/-/tree/master/doc
• https://gitlab.com/gitlab-org/gitaly
• https://gitlab.com/gitlab-org/gitaly/-/blob/master/doc/sidechannel.md
• https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/development/cicd/img/ci_architecture.png (has image)

[thien-do]

This has been implemented and removed. With memos.pub focusing on "membership" approach, with custom domain and config file, it doesn't worth it to continue with GitLab