Add area to the columns show for the directorate summary page

`owner:bartosz.balazinski@interdigital.com` `resolution_fixed` `type_defect`   |    by rjsparks@nostrum.com

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See https://datatracker.ietf.org/dir/

Area should be a (sortable) column

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_Issue migrated from trac:1940 at 2022-03-04 04:56:36 +0000_