[All Hosts] (devx) Reorg equivalent add-ins article (#5452)

* [All Hosts] (devx) Reorg equivalent add-ins article

* build errors

* various fixes

* bookmarks

* build link error

* delete mistake

* Apply suggestions from code review

Co-authored-by: Elizabeth Samuel <elizs@microsoft.com>

* Apply suggestions from code review

Co-authored-by: Elizabeth Samuel <elizs@microsoft.com>

* add include file

* fix error

* Apply suggestions from code review

Co-authored-by: Elizabeth Samuel <elizs@microsoft.com>

---------

Co-authored-by: Elizabeth Samuel <elizs@microsoft.com>

Author: Rick-Kirkham