chore: release v3.5.1 (#10385)

website/versioned_docs/version-3.5.1/guides/whats-next.mdx

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+# What's next?
+
+Congratulations! You have understood most core features of Docusaurus now. You have:
+
+- [Used the pages plugin](./creating-pages.mdx) to create a standalone React / Markdown page
+- [Used the docs plugin](./docs/docs-introduction.mdx) to create documentation pages. This includes [configuring the sidebar](./docs/sidebar/index.mdx), and even [versioning](./docs/versioning.mdx)
+- [Used the blog plugin](../blog.mdx) to create a fully featured blog
+- Tried your hands on [a range of Markdown features](./markdown-features/markdown-features-intro.mdx), which are useful for all content plugins
+- [Used stylesheets](../styling-layout.mdx) or [swizzling](../swizzling.mdx) to customize your site's appearance
+- [Included images and other assets](../static-assets.mdx) in your pages
+- [Added search](../search.mdx) to your site
+- Understood how [browser support](../browser-support.mdx) and [SEO](../seo.mdx) are done through standard Docusaurus APIs
+- Learned about how [individual plugins](../using-plugins.mdx) are installed and configured
+- [Deployed](../deployment.mdx) your site to a content host
+- [Internationalized](../i18n/i18n-tutorial.mdx) your site to include multiple languages
+
+At this point, you probably have a big `docusaurus.config.js` already😄 However, you haven't written much code yet! Most of the features are implemented through calling encapsulated Docusaurus APIs. As you continue your journey, you can take three paths:
+
+- Learn more advanced Docusaurus concepts. This will help you gain a deeper understand of what the APIs do.
+- Read about [all existing APIs](../docusaurus-core.mdx). Many of them have not been covered in the Guides!
+- Learn to [develop a plugin](../api/plugin-methods/README.mdx) to extend the functionality of your site.