Archive gexiv2-list

Requested details

@jensgeorg: Please confirm list is ready to be archived.

1. The list name: https://mail.gnome.org/archives/gexiv2-list
2. The rationale on why the mailing list should be archived (i.e project unmaintained): Mailing list was migrated over to Discourse, see https://mail.gnome.org/archives/gexiv2-list/2020-September/thread.html
3. Whether the list should be aliased to a specific other mailing list address: N/A

Additional information

Please remember we only remove the list information, subscriptions and NOT the archives themselves which are kept around for historical reasons.

/cc @averi