Github integration (#6414)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/presenters/unfurls/document.ts

@@ -1,11 +1,11 @@
-import { Unfurl, UnfurlType } from "@shared/types";
+import { UnfurlResponse, UnfurlType } from "@shared/types";
 import { User, Document } from "@server/models";
 import { presentLastActivityInfoFor } from "./common";
 
 function presentDocument(
   document: Document,
   viewer: User
-): Unfurl<UnfurlType.Document> {
+): UnfurlResponse<UnfurlType.Document> {
   return {
     url: document.url,
     type: UnfurlType.Document,