Revert part of the markdown cleanup: the two TrainingAreaBase plugin ICD docs and jenkins-ci-rme/README.md stay in the tree; the root migration/validation reports remain removed. README.md pointers to jenkins-ci-rme/README.md are restored.
Revert part of the markdown cleanup: the two TrainingAreaBase plugin ICD docs and jenkins-ci-rme/README.md stay in the tree; the root migration/validation reports remain removed. README.md pointers to jenkins-ci-rme/README.md are restored.