This started with
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24339 where a
broken link was introduced, but the lint checker never caught it.

The docs-lint job does the following:

```yaml
  script:
    - mv doc/ /tmp/gitlab-docs/content/
    - cd /tmp/gitlab-docs
    # Build HTML from Markdown
    - bundle exec nanoc
    # Check the internal links
    - bundle exec nanoc check internal_links
```

It moves the `doc/` dir inside `content` where Nanoc is expecting the
markdown files to be. It then builds the site and finally checks for
the links. If the built website was deployed to production, that would
be under `docs.gitlab.com/doc`.

The interesting part here is that
`[the logs](/doc/administration/logs.md#productionlog)`
translates to `<a href="/doc/administration/logs.html#productionlog>`,
so, Nanoc correctly sees this as an existing file!

This MR changes the path of the docs content to be equal to
$DOCS_GITLAB_REPO_SUFFIX which is defined as an environment
variable and takes the value of the slug of each project:
'ce', 'ee', 'omnibus', 'runner'.

Improve Review Apps documentation

See merge request gitlab-org/gitlab-ce!24597

[QA] Use public_email instead of email since it's available

Closes gitlab-org/quality/staging#27

See merge request gitlab-org/gitlab-ce!24533

Fix broken docs link

Closes #56754

See merge request gitlab-org/gitlab-ce!24611

Signed-off-by: Rémy Coutable <remy@rymai.me>

Added `btn_class` to the dropdown for custom notifications

See merge request gitlab-org/gitlab-ce!24557

Externalize strings from `/app/views/sent_notifications`

See merge request gitlab-org/gitlab-ce!24576

Update Helm to 2.12.2 to address Helm client vulnerability

Closes #56417

See merge request gitlab-org/gitlab-ce!24418

Signed-off-by: Rémy Coutable <remy@rymai.me>

Merge branch '56731-wait_for_job_to_be_done-gitlab-assets-compile-fails-in-the-review-build-cng-job' into 'master'

Resolve "`wait_for_job_to_be_done "gitlab:assets:compile"` fails in the `review-build-cng` job"

Closes #56731

See merge request gitlab-org/gitlab-ce!24598

Resolve "Changing wording to "Delete" when referring to removing a branch"

Closes #25569

See merge request gitlab-org/gitlab-ce!23966

Add troubleshooting section to Slack Notification Service

See merge request gitlab-org/gitlab-ce!24339

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix bug that caused Suggestion Markdown toolbar button to insert snippet with leading +/-/<space>

See merge request gitlab-org/gitlab-ce!24568

Add Avatar in the settings sidebar

Closes #56582

See merge request gitlab-org/gitlab-ce!24515

All review jobs should share the same only & except

Closes #56707

See merge request gitlab-org/gitlab-ce!24579

Fix serverless.yml template indentation

See merge request gitlab-org/gitlab-ce!24548

Avoid installing Bundler 2.0 or higher on source-based install

Closes #55979

See merge request gitlab-org/gitlab-ce!24502

Rename entrypoint for clusters update/edit page

Closes #56715

See merge request gitlab-org/gitlab-ce!24583

Upgrade Prettier to v1.16

See merge request gitlab-org/gitlab-ce!24581

Upgrade babel to v7.3

See merge request gitlab-org/gitlab-ce!24573

Add domain field into Clusters::Cluster

See merge request gitlab-org/gitlab-ce!24368

For the stake of standardizing, I've switched the ssl debugging to use
the Rails console rather than a Ruby script file.

Offer more explanation regarding the ssl-test script and how it's used.

This is to match `git branch -D <branchname>`

Use relative link rather than URL

Adds inter-service OpenTracing propagation

See merge request gitlab-org/gitlab-ce!24239

fix(labels): Move the primary button out of breadcrumbs and into the project section

Closes #56558

See merge request gitlab-org/gitlab-ce!24516

Upgrade gitlab-workhorse to 8.1.0

See merge request gitlab-org/gitlab-ce!24571