Reorder ci yaml reference doc

Restructure and reorder yaml reference, and
update a few anchors that changed slightly

doc/ci/examples/test_phoenix_app_with_gitlab_ci_cd/index.md

@@ -375,7 +375,7 @@ see if our latest code is running without errors.
 When we finish this edition, GitLab will start another build and show a **build running** badge. It
 is expected, after all we just configured GitLab CI/CD to do this for every push! But you may think
 "Why run build and tests for simple things like editing README.md?" and it is a good question.
-For changes that don't affect your application, you can add the keyword [`[ci skip]`](../../yaml/README.md#skipping-jobs)
+For changes that don't affect your application, you can add the keyword [`[ci skip]`](../../yaml/README.md#skip-pipeline)
 to commit message and the build related to that commit will be skipped.
 
 In the end, we finally got our pretty green build succeeded badge! By outputting the result on the

doc/user/project/repository/index.md

@@ -162,7 +162,7 @@ Via command line, you can commit multiple times before pushing.
   you will trigger a pipeline per push, not per commit.
   - **Skip pipelines:**
   You can add to you commit message the keyword
-  [`[ci skip]`](../../../ci/yaml/README.md#skipping-jobs)
+  [`[ci skip]`](../../../ci/yaml/README.md#skip-pipeline)
   and GitLab CI/CD will skip that pipeline.
   - **Cross-link issues and merge requests:**
   [Cross-linking](../issues/crosslinking_issues.md#from-commit-messages)