CI Docs update for Marketing

See merge request gitlab-org/gitlab-ce!30440

Update README.md - add CTA to watch Mastering CI/CD webcast and 5 teams that made the switch to GitLab CI/CD article

Add docs for template field in prometheus alerts

See merge request gitlab-org/gitlab-ce!30900

Add Troubleshooting section for Merge Train documentation

Closes #64948

See merge request gitlab-org/gitlab-ce!31033

Add trouble shooting sections

Update links to relative

Closes #61945

See merge request gitlab-org/gitlab-ce!31084

Following the single docs codebase change, all internal links
should be relative. Also cleans up one table

Resolve "Incorrect message interpolation on project listing"

Closes #65088

See merge request gitlab-org/gitlab-ce!31121

Logging sidekiq worker class name in SidekiqMemoryKiller

See merge request gitlab-org/gitlab-ce!30996

Fix outbound_local_requests_whitelist nil for existing ApplicationSetting records

Closes #65096

See merge request gitlab-org/gitlab-ce!31123

It needs to default to an empty array logically.

Add doc about incident issue labels

See merge request gitlab-org/gitlab-ce!31107

Add namespace label toggle

See merge request gitlab-org/gitlab-ce!30935

Added the ability to update the namespace label text for gitlab-managed

Add frozen_string_literal to spec/support

See merge request gitlab-org/gitlab-ce!31132

Remove \ from unicorn\_stderr.log

See merge request gitlab-org/gitlab-ce!31159

Support title and desc on merge w/ push option

See merge request gitlab-org/gitlab-ce!31068

Resolve "table_exists? not compatible with Rails 5.1"

Closes #54478

See merge request gitlab-org/gitlab-ce!30832

Remove duplicate content about auto-devops customization

See merge request gitlab-org/gitlab-ce!30929

Update guidance for EE doc submissions

See merge request gitlab-org/gitlab-ce!31042

Note GitLab University may be out of date in parts

See merge request gitlab-org/gitlab-ce!31034

Update documentation for current state

Closes #64710

See merge request gitlab-org/gitlab-ce!30873

Stop printing dots while retrieving pod in review-apps.sh

See merge request gitlab-org/gitlab-ce!31062

Improve steps for setting commit email

Closes #54881

See merge request gitlab-org/gitlab-ce!30833

Refine topics for Phase 2 of SSoT audit

Closes #64682

See merge request gitlab-org/gitlab-ce!30831

Includes admin_area and application_security
topics.

Restructure project cluster topic

See merge request gitlab-org/gitlab-ce!31081

Also fixes links to section headings that
have changed.

Add a section of examples to code review docs

Closes #64194

See merge request gitlab-org/gitlab-ce!30825

We have a fairly good guide to Code Reviews, but can be improved
by adding a few examples of what a good code review looks like
at GitLab, specifically ones where there is a bit of back and
forth, "nit-picking," etc. This would:

+ help set expectations of newly hired engineers around what our
process looks like when it is functioning what level of scrutiny
their code will be under

+ how we have technical conversations

+ show by example how after you're done crafting a solution, there
can still be extra work done either tidying up code and/or managing
the communication and conversations about your proposed MR

Fix typo in param name

See merge request gitlab-org/gitlab-ce!31100

Clarify difference between project name and project path for API usage

See merge request gitlab-org/gitlab-ce!31019