Redesigned the layout of the detect .NET Framework versions - fixed bugs - added info (#16967)

* Redid the layout of this article

* Fix up some minor issues

* updated screenshot

* Apply suggestions from code review

Co-Authored-By: Genevieve Warren <gewarren@microsoft.com>

* Swap style from code to bold for subkeys

* fix bookmark

Co-authored-by: Genevieve Warren <gewarren@microsoft.com>

Author: Thraka