update contributing entry points (#6380)

CONTRIBUTING.md

@@ -25,12 +25,12 @@ Entry points to be aware of are:
 
 - [`packages/create-svelte`](https://github.com/sveltejs/kit/tree/master/packages/create-svelte) - code that's run when you create a new project with `npm create svelte@latest`
 - [`packages/package`](https://github.com/sveltejs/kit/tree/master/packages/package) - for the `svelte-package` command
-- [`packages/kit/src/vite/index.js`](https://github.com/sveltejs/kit/blob/master/packages/kit/src/exports/vite/index.js) - for the Vite plugin
-- [`packages/kit/src/core/sync/index.js`](https://github.com/sveltejs/kit/blob/master/packages/kit/src/core/sync/sync.js) - for `svelte-kit sync`, which regenerates routing info and type definitions
+- [`packages/kit/src/core`](https://github.com/sveltejs/kit/tree/master/packages/kit/src/core) - code that's called at dev/build-time
+- [`packages/kit/src/core/sync`](https://github.com/sveltejs/kit/tree/master/packages/kit/src/core/sync) - for `svelte-kit sync`, which regenerates routing info and type definitions
+- [`packages/kit/src/runtime`](https://github.com/sveltejs/kit/tree/master/packages/kit/src/runtime) - code that's called at runtime
+- [`packages/kit/src/exports/vite`](https://github.com/sveltejs/kit/tree/master/packages/kit/src/exports/vite) - for all the Vite plugin related stuff
 - [`packages/adapter-[platform]`](https://github.com/sveltejs/kit/tree/master/packages) - for the various SvelteKit-provided adapters
 
-Most code called at build-time or from the CLI entry point lives in [packages/kit/src/core](https://github.com/sveltejs/kit/tree/master/packages/kit/src/core). Code that runs for rendering and routing lives in [packages/kit/src/runtime](https://github.com/sveltejs/kit/tree/master/packages/kit/src/runtime). Most changes to SvelteKit itself would involve code in these two directories.
-
 ## Testing
 
 Run `pnpm test` to run the tests from all subpackages. Browser tests live in subdirectories of `packages/kit/test` such as `packages/kit/test/apps/basics`.