Prepare for Docusaurus 3.5.0

For when facebook/docusaurus#10382
ships in a patch release.

Author: michaelklishin

docusaurus.config.js

@@ -182,6 +182,8 @@ const config = {
           editUrl:
             'https://github.com/rabbitmq/rabbitmq-website/tree/main/',
           rehypePlugins: [imgRendering],
+          // silence a warning about older blog posts with Docusaurus 3.5.0+
+          // onUntruncatedBlogPosts: 'ignore'
         },
         theme: {
           customCss: './src/css/custom.css',