Add youtube icons to youtube links

doc/ci/variables/README.md

@@ -20,12 +20,12 @@ that can be reused in different scripts.
 Variables are useful for customizing your jobs in GitLab CI/CD.
 When you use variables, you don't have to hard-code values.
 
-For more information about advanced use of GitLab CI/CD:
-
-- Get to productivity faster with these [7 advanced GitLab CI workflow hacks](https://about.gitlab.com/webcast/7cicd-hacks/)
-  shared by GitLab engineers.
-- Learn how the Cloud Native Computing Foundation (CNCF) [eliminates the complexity](https://about.gitlab.com/customers/cncf/)
-  of managing projects across many cloud providers with GitLab CI/CD.
+> For more information about advanced use of GitLab CI/CD:
+>
+> - <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>&nbsp;Get to productivity faster with these [7 advanced GitLab CI workflow hacks](https://about.gitlab.com/webcast/7cicd-hacks/)
+>   shared by GitLab engineers.
+> - <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>&nbsp;Learn how the Cloud Native Computing Foundation (CNCF) [eliminates the complexity](https://about.gitlab.com/customers/cncf/)
+>   of managing projects across many cloud providers with GitLab CI/CD.
 
 ## Predefined environment variables
 

doc/ci/yaml/README.md

@@ -25,13 +25,13 @@ We have complete examples of configuring pipelines:
 - For a collection of examples, see [GitLab CI/CD Examples](../examples/README.md).
 - To see a large `.gitlab-ci.yml` file used in an enterprise, see the [`.gitlab-ci.yml` file for `gitlab`](https://gitlab.com/gitlab-org/gitlab/blob/master/.gitlab-ci.yml).
 
-For some additional information about GitLab CI/CD:
-
-- Watch the [CI/CD Ease of configuration](https://www.youtube.com/embed/opdLqwz6tcE) video.
-- Watch the [Making the case for CI/CD in your organization](https://about.gitlab.com/compare/github-actions-alternative/)
-  webcast to learn the benefits of CI/CD and how to measure the results of CI/CD automation.
-- Learn how [Verizon reduced rebuilds](https://about.gitlab.com/blog/2019/02/14/verizon-customer-story/)
-  from 30 days to under 8 hours with GitLab.
+> For some additional information about GitLab CI/CD:
+>
+> - <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>&nbsp;Watch the [CI/CD Ease of configuration](https://www.youtube.com/embed/opdLqwz6tcE) video.
+> - Watch the [Making the case for CI/CD in your organization](https://about.gitlab.com/compare/github-actions-alternative/)
+>   webcast to learn the benefits of CI/CD and how to measure the results of CI/CD automation.
+> - <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>&nbsp;Learn how [Verizon reduced rebuilds](https://about.gitlab.com/blog/2019/02/14/verizon-customer-story/)
+>   from 30 days to under 8 hours with GitLab.
 
 NOTE: **Note:**
 If you have a [mirrored repository where GitLab pulls from](../../user/project/repository/repository_mirroring.md#pulling-from-a-remote-repository-starter),

doc/gitlab-basics/start-using-git.md

@@ -24,7 +24,7 @@ can download GitLab's [Git Cheat Sheet](https://about.gitlab.com/images/press/gi
 
 > For more information about the advantages of working with Git and GitLab:
 >
-> - Watch the [GitLab Source Code Management Walkthrough](https://www.youtube.com/watch?v=wTQ3aXJswtM) video.
+> - <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>&nbsp;Watch the [GitLab Source Code Management Walkthrough](https://www.youtube.com/watch?v=wTQ3aXJswtM) video.
 > - Learn how GitLab became the backbone of [Worldline](https://about.gitlab.com/customers/worldline/)’s development environment.
 
 TIP: **Tip:**

doc/topics/git/numerous_undo_possibilities_in_git/index.md

@@ -28,7 +28,7 @@ and access them with direct commit ID. Read more about _[redoing the undo](#redo
 
 > For more information about working with Git and GitLab:
 >
-> - Learn why [North Western Mutual chose GitLab](https://youtu.be/kPNMyxKRRoM) for their Enterprise source code management.
+> - <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>&nbsp;Learn why [North Western Mutual chose GitLab](https://youtu.be/kPNMyxKRRoM) for their Enterprise source code management.
 > - Learn how to [get started with Git](https://about.gitlab.com/resources/whitepaper-moving-to-git/).
 
 ## Introduction