Use @uiw/react-codemirror and react@18

Updating redocly to latest and leveraging `@uiw/react-codemirror` which
it also uses.

content/shared/editor/javascript-editor.tsx

@@ -0,0 +1,15 @@
+import { javascript } from '@codemirror/lang-javascript'
+import { Editor, EditorWrapperProps } from './editor'
+
+export const JavascriptEditor = ({value, onChange, readOnly }: EditorWrapperProps) => {
+    return <Editor
+        value={value}
+        onChange={onChange}
+        readOnly={readOnly}
+        extensions={
+            [
+                javascript(),
+            ]
+        }
+    />
+}