Revert code-block-tests.mdx

website/_dogfooding/_pages tests/code-block-tests.mdx

@@ -11,13 +11,6 @@ class HelloWorld {
 }
 ```
 
-```js
-function PageLayout(props) {
-  // highlight-next-line
-  return <Layout title="My awesome Docusaurus page" description="Just one more awesome p">;
-}
-```
-
 See:
 
 - https://github.com/facebook/docusaurus/pull/1584
@@ -116,7 +109,7 @@ Multi-line text inside `pre` will turn into one-liner, but it's okay (https://gi
 
 <CodeBlock>1 2 3</CodeBlock>
 
-<CodeBlock className="language-yaml" title="test" showLineNumbers>
+<CodeBlock className="language-yaml" title="test">
   {`link:
   title: front page
   path: /docs/`}