feat(rss-feed): add configurable description max length (#7051)

Co-authored-by: ajnart <thomas@ajnart.dev>

apps/docs/docs/widgets/rss-feed/index.tsx

@@ -42,6 +42,12 @@ export const rssFeedWidget: WidgetDefinition = {
         values: "1-50",
         defaultValue: "5",
       },
+      {
+        name: "Description max length",
+        description: "Maximum number of characters to keep from the feed description",
+        values: "1-5000",
+        defaultValue: "250",
+      },
       {
         name: "Amount posts limit",
         description: "Maximum number of posts to show",