fix: update readwise example to work without duplicating nodes

this is a workaround to the fact that readwise use cursor pagination
instead of offset pagination, proper handling will be added later

examples/mock_data/Readwise/Highlights export.bru

@@ -0,0 +1,15 @@
+meta {
+  name: Highlights export
+  type: http
+  seq: 3
+}
+
+get {
+  url: https://readwise.io/api/v3/list/?withHtmlContent=true
+  body: none
+  auth: inherit
+}
+
+params:query {
+  withHtmlContent: true
+}