Change links to relative

Make several links, mostly in admin troubleshooting,
relative, as is the standard

doc/administration/troubleshooting/gitlab_rails_cheat_sheet.md

@@ -64,7 +64,7 @@ Array.methods.grep(/sing/)
 
 ## Find method source
 
-Works for [non-instrumented methods](https://docs.gitlab.com/ce/development/instrumentation.html#checking-instrumented-methods):
+Works for [non-instrumented methods](../../development/instrumentation.md#checking-instrumented-methods):
 
 ```ruby
 instance_of_object.method(:foo).source_location
@@ -474,7 +474,7 @@ User.active.count
 ```
 
 ```bash
-# Using curl and jq (up to a max 100, see [pagination](https://docs.gitlab.com/ee/api/#pagination)
+# Using curl and jq (up to a max 100, see pagination docs https://docs.gitlab.com/ee/api/#pagination
 curl --silent --header "Private-Token: ********************" "https://gitlab.example.com/api/v4/users?per_page=100&active" | jq --compact-output '.[] | [.id,.name,.username]'
 ```
 
@@ -744,7 +744,7 @@ build.dependencies.each do |d| { puts "status: #{d.status}, finished at: #{d.fin
 
 ### Disable strict artifact checking (Introduced in GitLab 10.3.0)
 
-See <https://docs.gitlab.com/ee/administration/job_artifacts.html#validation-for-dependencies>.
+See [job artifacts documentation](../job_artifacts.md#validation-for-dependencies).
 
 ```ruby
 Feature.enable('ci_disable_validates_dependencies')

doc/administration/troubleshooting/kubernetes_cheat_sheet.md

@@ -177,7 +177,7 @@ and they will assist you with any issues you are having.
   ```
 
   After <https://gitlab.com/gitlab-org/charts/gitlab/issues/780> is fixed, it should
-  be possible to use [Updating GitLab using the Helm Chart](https://docs.gitlab.com/ee/install/kubernetes/gitlab_chart.html#updating-gitlab-using-the-helm-chart)
+  be possible to use [Updating GitLab using the Helm Chart](https://docs.gitlab.com/charts/index.html#updating-gitlab-using-the-helm-chart)
   for upgrades.
 
 - How to apply changes to GitLab config:
@@ -244,7 +244,7 @@ to those documents for details.
   on your workstation.
 
 - When all the pods show either a `Running` or `Completed` status, get the GitLab password as
-  described in [Initial login](https://docs.gitlab.com/ee/install/kubernetes/gitlab_chart.html#initial-login),
+  described in [Initial login](https://docs.gitlab.com/charts/installation/deployment.html#initial-login),
   and log in to GitLab via the UI. It will be accessible via `https://gitlab.domain`
   where `domain` is the value provided in the yaml file.
 

doc/administration/troubleshooting/linux_cheat_sheet.md

@@ -259,7 +259,7 @@ then compare summaries of both results and dive into the differences.
 Rough numbers for calls to `open` and `openat` (used to access files) on various configurations.
 Slow storage can cause the dreaded `DeadlineExceeded` error in Gitaly.
 
-Also [see this entry](https://docs.gitlab.com/ee/administration/operations/filesystem_benchmarking.html)
+Also [see this entry](../operations/filesystem_benchmarking.md)
 in the handbook for quick tests customers can perform to check their filesystem performance.
 
 Keep in mind that timing information from `strace` is often somewhat inaccurate, so

doc/administration/troubleshooting/test_environments.md

@@ -23,7 +23,7 @@ but contributions are welcome.
 
 ### GitLab
 
-Please see [our Docker test environment docs](https://docs.gitlab.com/ee/install/digitaloceandocker.html#create-new-gitlab-container)
+Please see [our Docker test environment docs](../../install/digitaloceandocker.md#create-new-gitlab-container)
 for how to run GitLab on Docker. When spinning this up with `docker-machine`, ensure
 you change a few things:
 
@@ -59,7 +59,7 @@ docker run --name gitlab_saml -p 8080:8080 -p 8443:8443 \
 -d jamedjo/test-saml-idp
 ```
 
-The following will also need to go in your `/etc/gitlab/gitlab.rb`. See [our SAML docs](https://docs.gitlab.com/ee/integration/saml.html)
+The following will also need to go in your `/etc/gitlab/gitlab.rb`. See [our SAML docs](../../integration/saml.md)
 for more, as well as the list of [default usernames, passwords, and emails](https://hub.docker.com/r/jamedjo/test-saml-idp/#usage).
 
 ```ruby

doc/ci/docker/using_docker_build.md

@@ -580,7 +580,7 @@ For private and internal projects:
 If you want to use your own Docker images for docker-in-docker there are a few things you need to do in addition to the steps in the [docker-in-docker](#use-docker-in-docker-workflow-with-docker-executor) section:
 
 1. Update the `image` and `service` to point to your registry.
-1. Add a service [alias](https://docs.gitlab.com/ee/ci/yaml/#servicesalias).
+1. Add a service [alias](../yaml/README.md#servicesalias).
 
 Below is an example of what your `.gitlab-ci.yml` should look like,
 assuming you have it configured with [TLS enabled](#tls-enabled):

doc/ci/yaml/README.md

@@ -2089,7 +2089,7 @@ staging:
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23464) in GitLab 12.3.
 
 `interruptible` is used to indicate that a job should be canceled if made redundant by a newer run of the same job. Defaults to `true`.
-This value will only be used if the [automatic cancellation of redundant pipelines feature](https://docs.gitlab.com/ee/user/project/pipelines/settings.html#auto-cancel-pending-pipelines)
+This value will only be used if the [automatic cancellation of redundant pipelines feature](../../user/project/pipelines/settings.md#auto-cancel-pending-pipelines)
 is enabled.
 
 When enabled, a pipeline on the same branch will be canceled when:

doc/subscriptions/index.md

@@ -115,7 +115,7 @@ To subscribe to GitLab through a self-managed installation:
 
 1. [Install](https://about.gitlab.com/install/) GitLab.
 1. Complete the installation with
-   [administration tasks](https://docs.gitlab.com/ee/administration/).
+   [administration tasks](../administration/index.md).
 1. Select the **Starter**, **Premium**, or **Ultimate** self-managed plan
    through the [GitLab Subscription Manager](https://customers.gitlab.com/).
 1. Apply your license file. After purchase, a license file is sent to the email