fluture: add news entry

assets/javascripts/news.json

@@ -1,4 +1,8 @@
 [
+  [
+    "2023-08-24",
+    "New documentation: <a href=\"/fluture/\">Fluture</a>"
+  ],
   [
     "2022-12-20",
     "New documentations: <a href=\"/qunit/\">QUnit</a>, <a href=\"/wagtail/\">Wagtail</a>"