feat: Add HTML export option (#4056)

* tidy

* Add title to HTML export

* fix: Add compatability for documents without collab state

* Add HTML download option to UI

* docs

* fix nodes that required document to render

* Refactor to allow for styling of HTML export

* div>article for easier programatic content extraction

app/utils/ApiClient.ts

@@ -25,6 +25,7 @@ type Options = {
 
 type FetchOptions = {
   download?: boolean;
+  headers?: Record<string, string>;
 };
 
 const fetchWithRetry = retry(fetch);
@@ -81,6 +82,7 @@ class ApiClient {
       "cache-control": "no-cache",
       "x-editor-version": EDITOR_VERSION,
       pragma: "no-cache",
+      ...options?.headers,
     };
 
     // for multipart forms or other non JSON requests fetch