Revert "Removed link to Changing Stacks topic [#164374199]"
Revert "Removed link to Changing Stacks topic [#164374199]"

This reverts commit 70193de135610838b8f1078fa28f9b6eceee35f1.

cloudfoundry/docs-book-cloudfoundry,swisscom/docs-appcloud-book,swisscom/docs-appcloud-book,swisscom/docs-appcloud-book,swisscom/docs-appcloud-book,cloudfoundry/docs-book-cloudfoundry,cloudfoundry/docs-book-cloudfoundry,cloudfoundry/docs-book-cloudfoundry