Import repositories section is outdated and no longer works

[FluffyDiscord]

Title

[kkimurak]

The feature "bare repository importing" have been removed on v16.0.0 release and rake task gitlab:import:repos should not work any more. See upstream merge request that did it : https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118676

The rake task gitlab:import:repos is replaced by gitalb:import_export:import[:username, :namespace_path, :project_path, :archive_path]. Note that it does not allow importing bare repository and requires gzip archive of repository.

We have to update documentation based on https://docs.gitlab.com/17.6/ee/administration/raketasks/project_import_export.html#import-large-projects (link to latest stable release 17.6) or https://docs.gitlab.com/ee/administration/raketasks/project_import_export.html#import-large-projects (latest docs)