BSI Flex: Back cover page preface sections conversion

[Intelligent2013]

From https://github.com/metanorma/metanorma-bsi/issues/185#issuecomment-1424417292.

On hold.

When BSI Flex NISO STS XML will be available, add NISO STS elements conversion into Metanorma adoc:

[.preface,type=cover-page-info]
== {blank}

This BSI Flex is part of a wider programme of work around XXXX. For more information, go
to: https://www.bsigroup.com/XXX

Information on the development of this BSI Flex can be found at:
https://www.bsigroup.com/XXX

BSI Flex standards provide a new, flexible way to develop consensus-based good practice
that dynamically adapts to keep pace with fast-changing markets. For more information, go to:
https://www.bsigroup.com/en-GB/our-services/standards-services/flex/

[.preface,type=release-history]
== Release history

First version November 2021