feat: edit org display names and descriptions (#13474)

coderd/database/migrations/000216_organization_display_name.down.sql

@@ -0,0 +1,2 @@
+alter table organizations
+	drop column display_name;

coderd/database/migrations/000216_organization_display_name.up.sql

@@ -0,0 +1,10 @@
+-- This default is just a temporary thing to avoid null errors when first creating the column.
+alter table organizations
+	add column display_name text not null default '';
+
+update organizations
+	set display_name = name;
+
+-- We can remove the default now that everything has been copied.
+alter table organizations
+	alter column display_name drop default;