fix(blog): merge defaultJSXConverters to prevent 'unknown node' on standard Lexical nodes

apps/web/src/components/PayloadRichText.tsx

@@ -1,4 +1,7 @@
-import { RichText } from "@payloadcms/richtext-lexical/react";
+import {
+  RichText,
+  defaultJSXConverters,
+} from "@payloadcms/richtext-lexical/react";
 import type { JSXConverters } from "@payloadcms/richtext-lexical/react";
 import { MemeCard } from "@/src/components/MemeCard";
 import { Mermaid } from "@/src/components/Mermaid";
@@ -40,6 +43,7 @@ function renderInlineMarkdown(text: string): React.ReactNode {
 }
 
 const jsxConverters: JSXConverters = {
+  ...defaultJSXConverters,
   blocks: {
     memeCard: ({ node }: any) => (
       <div className="my-8">