Update compile.md preprocessor link.

Original preprocessor link is dead github repo that points to https://sveltesociety.dev/. I thought the link should just take you there now and to the relevant section.

site/content/docs/04-compile-time.md

@@ -190,7 +190,7 @@ const ast = svelte.parse(source, { filename: 'App.svelte' });
 
 ### `svelte.preprocess`
 
-A number of [community-maintained preprocessing plugins](https://github.com/sveltejs/integrations#preprocessors) are available to allow you to use Svelte with tools like TypeScript, PostCSS, SCSS, and Less.
+A number of [community-maintained preprocessing plugins](https://sveltesociety.dev/tools#preprocessors) are available to allow you to use Svelte with tools like TypeScript, PostCSS, SCSS, and Less.
 
 You can write your own preprocessor using the `svelte.preprocess` API.