Disable parallel make, because the Makefile is written funny. Now it
won't fail if make is run with -j # (e.g. because MAKEFLAGS includes
-j #).

Ignore all directories starting with `repositories`

See merge request !294

When using the backup/restore task, GitLab copies the repositories
directory to a place like repositories.old.1493107724. This was
resulting in Git complaining about untracked files. Ignoring
everything starting with repositories solves that issue.

Install yarn in GDK docker image

Closes #221

See merge request !293

Update GitLab EE related section in docs

Closes #214

See merge request !292

Use yarn instead of npm in Makefile

See merge request !275

Added experimental WSL gdk installation instructions

See merge request !290

Also made yarn a mandatory installation process.

Some corrections

Removed some redudant troubleshooting options

Remove `killall node` now that webpack-dev-server bug has been fixed

See merge request !289

Re-create nginx.conf during reconfigure

See merge request !288

Delete all the config.tomls

Closes #218

See merge request !287

Move gitlab-shell to make Go development easier

See merge request !282

Add support for running GitLab Geo tracking database

See merge request !258

Expand the Prerequisites section of the replication howto

[ci skip]

See merge request !285

[ci skip]

See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1197

Improve GitLab Geo replicated database support

See merge request !270