(core) Show usage banners in doc menu of free team sites

Summary:
Also fixes a minor CSS regression in UserManager where the
link to add a team member wasn't shown on a separate row.

Test Plan: Browser tests.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D3444

app/common/UserAPI.ts

@@ -6,7 +6,7 @@ import {BrowserSettings} from 'app/common/BrowserSettings';
 import {BulkColValues, TableColValues, TableRecordValue, TableRecordValues, UserAction} from 'app/common/DocActions';
 import {DocCreationInfo, OpenDocMode} from 'app/common/DocListAPI';
 import {OrgUsageSummary} from 'app/common/DocUsage';
-import {Features} from 'app/common/Features';
+import {Product} from 'app/common/Features';
 import {ICustomWidget} from 'app/common/CustomWidget';
 import {isClient} from 'app/common/gristUrls';
 import {FullUser} from 'app/common/LoginSessionAPI';
@@ -73,12 +73,6 @@ export interface BillingAccount {
   };
 }
 
-// Information about the product associated with an org or orgs.
-export interface Product {
-  name: string;
-  features: Features;
-}
-
 // The upload types vary based on which fetch implementation is in use.  This is
 // an incomplete list.  For example, node streaming types are supported by node-fetch.
 export type UploadType = string | Blob | Buffer;