docs: update docusaurus to v3 (#5625)

* update dependencies

* update onboarding mdx

* fixes for mdx issues

* fixes for mdx compatibility

* resolve mdx errors

* fixes in reference

* fix check errors

* revert change in vale action

* fix node version in action

* fix summary in markdown

www/apps/docs/src/theme/CodeBlock/index.tsx

@@ -36,7 +36,6 @@ export default function CodeBlock({
 
   const title = props.title
   delete props.title
-
   return (
     <div className="code-wrapper">
       {title && <div className="code-header">{title}</div>}