remove git annex from bootcamp / advanced topics
It probably doesn't make sense for folk to earn their Git Annex badge any more.
https://docs.gitlab.com/ee/workflow/git_annex.html
Warning: GitLab has completely removed in GitLab 9.0 (2017/03/22). Read through the migration guide from git-annex to Git LFS.
gitlab-org/gitlab#1648 (closed)
Remove Git Annex
Git Annex is replaced by LFS and just a burden to support, let's remove it.