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

Remove unneeded trailing whitespace in lines in
/development /ci /api and /administration docs.

Updating redirected links in the development, install, policy
raketasks and university dirs. Should now link to final
URL to avoid redirect hops

Fixing square brackets, links, etc in:
  merge_requests.md
  vulnerabilities.md
  issues.md
  issues_statistics.md
  pipelines.md
  services.md
  group_milestones.md
  milestones.md
  runners.md
  changelog.md
  issue_workflow.md
  elasticsearch.md
  api_graphql_styleguide.md
  automatic_ce_ee_merge.md
  file_storage.md
  architecture.md
  database_debugging.md
  index.md
  index.md
  frontend_testing.md
  pry_debugging.md
  vue.md
  development_process.md

Based on https://about.gitlab.com/handbook/product/categories/#release-stage:
- 'core release' -> 'progressive delivery'
- 'supporting capabilities' -> 'release management'

Adjusts asterisks to hyphens in assorted docs to allow lint rule to pass

Mentions the automatic inference of stage and group labels based
on the applied subject labels

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

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

Markdown renderers find it easier to determine
where lists start and end when lists are surrounded
by new lines.

For consistency, also ensure entries in the list
are aligned when they span multipls lines.

just ~feature.

Signed-off-by: NTakuya Noguchi <takninnovationresearch@gmail.com>

Label CI/CD has been deprecated (cf. ~CI/CD-DoNotUse ) and its description says to use ~Release or ~Verify

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

This removes duplicated content from CONTRIBUTING.md and consolidate
everything under doc/development/contributing/.

This also fixes missing links.

Lastly, this moves the style guides from the "Implement design & UI
elements" page to a new "Style guides" page.
Signed-off-by: NRémy Coutable <remy@rymai.me>

- Also fix some markdown syntax.