Upgrade to Docusaurus 3.5.x

3.5.1 contains an Algolia search plugin fix [1].

While at it, fix a few warnings emitted on/by the 3.5.x
series.

1. facebook/docusaurus#10384

blog/2024-05-23-erlang27-support/index.md

@@ -6,10 +6,14 @@ authors: [kura]
 
 [Erlang/OTP 27.0 was released on May 20th, 2024](https://www.erlang.org/blog/highlights-otp-27/).
 While it contains a lot of exciting features and improvements, unfortunately RabbitMQ currently
-doesn't work well with this version. We are aware of significant performance regressions,
+doesn't work well with this version.
+
+<!-- truncate -->
+
+Our team has discovered significant performance regressions on Erlang 27,
 as high as 30% lower message throughput in many common workloads.
 
-We are investigating the root cause of this regression.
+We are investigating the root cause of the regressions.
 Please do not use Erlang/OTP 27 with RabbitMQ at this time.
 
 We will announce support for Erlang/OTP 27 when we are confident that it works well with RabbitMQ.

docusaurus.config.js

@@ -183,7 +183,7 @@ const config = {
             'https://github.com/rabbitmq/rabbitmq-website/tree/main/',
           rehypePlugins: [imgRendering],
           // silence a warning about older blog posts with Docusaurus 3.5.0+
-          // onUntruncatedBlogPosts: 'ignore'
+          onUntruncatedBlogPosts: 'ignore'
         },
         theme: {
           customCss: './src/css/custom.css',