* use tagged regions for release notes

* rename apm-breaking, point to apm-server

* remove data and spec directories, point to apm-server

(cherry picked from commit d4309b5)

# Conflicts:
#	docs/en/apm-server/apm-breaking.asciidoc
#	docs/en/apm-server/data-model.asciidoc
#	docs/en/apm-server/data/elasticsearch/generated/errors.json
#	docs/en/apm-server/data/elasticsearch/generated/spans.json
#	docs/en/apm-server/data/elasticsearch/generated/transactions.json
#	docs/en/apm-server/data/elasticsearch/metricset.json
#	docs/en/apm-server/release-notes.asciidoc
#	docs/en/apm-server/spec/rumv3/error.json
#	docs/en/apm-server/spec/rumv3/span.json
#	docs/en/apm-server/spec/rumv3/transaction.json
#	docs/en/apm-server/spec/v2/error.json
#	docs/en/apm-server/spec/v2/metadata.json
#	docs/en/apm-server/spec/v2/span.json
#	docs/en/apm-server/spec/v2/transaction.json