(core) Remove a defunct URL constant and a product flavor.

Summary:
The URL /create-team-site on marketing site is unused, and no longer pointing to
anything functional.

The "efcr" product flavor has been defunct for a long time. Remove
references to it.

Test Plan: No tests should be affected

Reviewers: JakubSerafin

Reviewed By: JakubSerafin

Subscribers: JakubSerafin

Differential Revision: https://phab.getgrist.com/D3890

app/client/ui/CustomThemes.ts

@@ -1,7 +1,7 @@
 import {GristLoadConfig} from 'app/common/gristUrls';
 import {styled} from 'grainjs';
 
-export type ProductFlavor = 'grist' | 'efcr' | 'fieldlink';
+export type ProductFlavor = 'grist' | 'fieldlink';
 
 export interface CustomTheme {
   bodyClassName?: string;
@@ -20,8 +20,6 @@ export function getFlavor(org?: string): ProductFlavor {
   }
   if (org === 'fieldlink') {
     return 'fieldlink';
-  } else if (org && /^nioxus(-.*)?$/.test(org)) {
-    return 'efcr';
   }
   return 'grist';
 }
@@ -33,25 +31,11 @@ export function getTheme(flavor: ProductFlavor): CustomTheme {
         wideLogo: true,
         bodyClassName: cssFieldLinkBody.className,
       };
-    case 'efcr':
-      return {bodyClassName: cssEfcrBody.className};
     default:
       return {};
   }
 }
 
-const cssEfcrBody = styled('body', `
-  --icon-GristLogo: url("icons/logo-efcr.png");
-  --grist-logo-bg: #009975;
-  --grist-color-light-green: #009975;
-  --grist-color-dark-green: #007F61;
-  --grist-primary-fg: #009975;
-  --grist-primary-fg-hover: #007F61;
-  --grist-control-fg: #009975;
-  --grist-color-darker-green: #004C38;
-  --grist-color-dark-bg: #004C38;
-`);
-
 const cssFieldLinkBody = styled('body', `
   --icon-GristLogo: url("icons/logo-fieldlink.png");
   --icon-GristWideLogo: url("icons/logo-fieldlink.png");