- New redirect doc/user/application_security/license_compliance/index.md
- Renaming of images.
- Some links that were pointing to the old location are fixed.

Align images and lists in assorted markdown docs

Let's use disqus_identifier since this is a more
descriptive name. We will need redirect_from for
another purpose anyway (Nanoc redirects).

Many code blocks are 4spaced, and they render in GitLab
without coloring as a result, even though they are
fenced with a language label. If in a list, other items
will render as being in a code block too, even if not
meant to. This fixes all these issues for most docs in
/ci, and cleans up other minor whitespace issues too.

`docker-in-docker` is a workflow not an specific executor. It uses the
[Docker executor](https://docs.gitlab.com/runner/executors/docker.html).

documentation: fix a typo in ci/examples

See merge request gitlab-org/gitlab-ce!31250

This commit fixes a typo in the ci/examples
documentation

Ensure that all numbered lists use only 1. and no other numbers.
Also ensure that numbered lists use proper spacing.