bun: add news entry

assets/javascripts/news.json

@@ -1,7 +1,7 @@
 [
   [
     "2025-10-19",
-    "New documentations: <a href=\"/lit/\">Lit</a>, <a href=\"/graphviz/\">Graphviz</a>"
+    "New documentations: <a href=\"/lit/\">Lit</a>, <a href=\"/graphviz/\">Graphviz</a>, <a href=\"/bun/\">Bun</a>"
   ],
   [
     "2025-07-14",