Add icon column to document (#7066)

* Add icon column to document

* Backfill columns

---------

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

server/queues/tasks/ImportTask.ts

@@ -61,6 +61,8 @@ export type StructuredImportData = {
     urlId?: string;
     title: string;
     emoji?: string | null;
+    icon?: string | null;
+    color?: string | null;
     /**
      * The document text. To reference an attachment or image use the special
      * formatting <<attachmentId>>. It will be replaced with a reference to the