Fix redirect links and anchors

doc/ci/examples/devops_and_game_dev_with_gitlab_ci_cd/index.md

 ---
-redirect_to: '../README.md#ci-cd-examples'
+redirect_to: '../README.md#contributed-examples'
 ---
 
 This document was moved to [another location](../README.md#contributed-examples).

doc/ci/examples/test-phoenix-application.md

 ---
-redirect_to: '../../ci/examples/test_phoenix_app_with_gitlab_ci_cd/index.md'
+redirect_to: 'README.md'
 ---
 
-The content of this page was incorporated in [this document](../../ci/examples/test_phoenix_app_with_gitlab_ci_cd/index.md).
+This example is no longer available. [View other examples](README.md).
 
 <!-- This redirect file can be deleted after February 1, 2021. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/ci/examples/test-scala-application.md

 ---
-redirect_to: '../README.md#contributed-examples'
+redirect_to: 'README.md#contributed-examples'
 ---
 
-This document was moved to [another location](../README.md#contributed-examples).
+This document was moved to [another location](README.md#contributed-examples).
 
 <!-- This redirect file can be deleted after 2021-04-18. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->