add some stuff on shallow routing

Author: Rich-Harris

documentation/blog/2023-12-14-sveltekit-2.md

@@ -5,7 +5,7 @@ author: The Svelte team
 authorURL: https://kit.svelte.dev/
 ---
 
-Version 2.0 of [SvelteKit](https://kit.svelte.dev), the official framework for building apps with Svelte, is now available. It is an incremental release that adds support for the newly-released [Vite 5](https://vitejs.dev/blog/announcing-vite5) along with a bevy of small improvements.
+Version 2.0 of [SvelteKit](https://kit.svelte.dev), the official framework for building apps with Svelte, is now available. It is an incremental release that adds support for the newly-released [Vite 5](https://vitejs.dev/blog/announcing-vite5) along with a bevy of small improvements and one much-requested feature.
 
 If you've been paying close attention to Svelte in recent months, you'll know that we've been [hard at work on Svelte 5](https://svelte-5-preview.vercel.app/docs/introduction), which is possibly the most anticipated release in the project's history. Upgrading to SvelteKit 2 will smooth the path for Svelte 5 when it is released in 2024, and we encourage all users to upgrade when you get a chance.
 
@@ -17,6 +17,12 @@ npx svelte-migrate sveltekit-2
 
 The [migration guide](https://kit.svelte.dev/docs/migrating-to-sveltekit-2) has more details about what's new.
 
+## Shallow routing
+
+Way back in the mists of time — May, to be precise — we [teased a new feature](https://www.youtube.com/watch?v=HdkJTOTY-Js) that allows you to associate state with a history entry without causing navigation. It's very useful for creating modals that you can dismiss by swiping back, or pop-up views of routes you don't want to do a full navigation to.
+
+That feature is called [shallow routing](https://kit.svelte.dev/docs/shallow-routing), and this week we finally dusted off the pull request and added it to the framework. We're excited to see what you use it for.
+
 ## 1 year of SvelteKit
 
 Today is the 1 year anniversary of SvelteKit’s launch and we’re excited to celebrate how far SvelteKit has come. SvelteKit has been quickly embraced by the web development community: