Huge clean up GitLab CI references

No header title was removed, those that refered to CI got the following text in them:

This section is deprecated for GitLab 8.0 and later versions.

Those below are the ones I haven't touched:

ack gitlab-ci doc/


common_installation_problems/README.md
275:### Error executing action create on resource cron[gitlab-ci schedule builds]
278:1. Check if user `gitlab-ci` is in `/etc/cron.deny` and if yes remove it. You can add the `gitlab-ci` user to `/etc/cron.allow``.
279:1. Check if you have PAM enabled and if gitlab-ci user is allowed to access crontab. If yes, try changing your `/etc/security/access.conf` to allow the user access to the resource, for example `+:gitlab-ci:ALL`.

README.md
45:- [Updating from GitLab CI version prior to 5.4.0 to the latest version](update/README.md#updating-from-gitlab-ci-version-prior-to-540-to-the-latest-version)
52:- [GitLab CI shows GitLab login page](common_installation_problems/README.md#gitlab-ci-shows-gitlab-login-page).

update.md
46:See [doc/update/README.md.](doc/update/README.md#updating-from-gitlab-ci-version-prior-to-540-to-the-latest-version)

gitlab-ci/README.md
3:You can run a [GitLab CI](https://about.gitlab.com/gitlab-ci/) Coordinator

Closes #913 (closed)

Title changed from Clean up GitLab CI references to Huge clean up GitLab CI references

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mentioned in merge request gitlab-recipes!41 (merged)

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Nice, thanks @axil ! Let me know when you are ready to have it merged.

It's ready, but let's wait until friday with the 8.2 release.

@axil Why wait? The info here is current now and we need to release a rc1 package today

Ok go for it and I'll merge the recipes MR with the configs as well.

Edit: wait found some small glitches, pushing a quick fix now.

Title changed from [WIP] Huge clean up GitLab CI references to Huge clean up GitLab CI references

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• 5f0ac610 - Encapsulate note in italics
• 739c32c3 - Use local IP to make it consistent with recipes configs

Ok done.

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• 499e6f33 - Add note about minimum GitLab version when changing workhorse vars

mentioned in commit 248d2628

Status changed to merged

Thanks @axil!

mentioned in commit 6cc9dd93

mentioned in commit 775fed34