docs: reference preview docs page and @next package

Author: sfriedel

docs-site/package.json

@@ -7,6 +7,7 @@
 		"dev": "vite dev",
 		"prebuild": "pnpm run --dir ../packages/svelte-fluent package",
 		"build": "vite build",
+		"build:preview": "SVELTEKIT_BASE='' vite build",
 		"preview": "vite preview",
 		"prepare": "svelte-kit sync",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",

docs-site/src/routes/docs/getting-started/+page.svelte.md

@@ -21,7 +21,7 @@ the [Fluent](https://projectfluent.org/) localization system by Mozilla.
 Install `svelte-fluent` and its peer dependency `jsdom` with your package manager of choice.
 
 ```sh
-npm install --save-dev @nubolab-ffwd/svelte-fluent
+npm install --save-dev @nubolab-ffwd/svelte-fluent@next
 npm install --save jsdom
 ```
 

docs-site/svelte.config.js

@@ -5,7 +5,7 @@ import { mdsxConfig } from './mdsx.config.js';
 
 const isProdBuild = process.env.NODE_ENV === 'production';
 
-const base = isProdBuild ? '/svelte-fluent' : '';
+const base = process.env.SVELTEKIT_BASE ?? (isProdBuild ? '/svelte-fluent' : '');
 
 /** @type {import('@sveltejs/kit').Config} */
 const config = {

packages/svelte-fluent/README.md

@@ -1,19 +1,26 @@
 # Svelte Fluent [![Documentation](https://img.shields.io/badge/-Documentation-blue)](https://nubolab-ffwd.github.io/svelte-fluent/) [![svelte-fluent on npm](https://img.shields.io/npm/v/@nubolab-ffwd/svelte-fluent)](https://www.npmjs.com/package/@nubolab-ffwd/svelte-fluent) ![Tests](https://github.com/nubolab-ffwd/svelte-fluent/workflows/Tests/badge.svg) [![Svelte v5](https://img.shields.io/badge/svelte-v5-blueviolet?logo=svelte)](https://svelte.dev)
 
+> [!IMPORTANT]
+> This branch contains a **preview version** of `svelte-fluent` v2.
+> If you're looking for the stable version, switch to the `main` branch.
+>
+> Check the [Version 2](https://svelte-fluent-v2-preview.netlify.app/docs/version-2/)
+> page of the preview documentation site to get an overview of the changes.
+
 `svelte-fluent` is a powerful localization library for
 [Svelte](https://svelte.dev/) and [SvelteKit](https://kit.svelte.dev/)
 that enables you to integrate translations using Mozilla's natural-sounding Fluent syntax easily.
 
 ## Installation
 
 ```
-npm install --save-dev @nubolab-ffwd/svelte-fluent
+npm install --save-dev @nubolab-ffwd/svelte-fluent@next
 npm install --save jsdom
 ```
 
 ## Documentation
 
-Documentation can be found at https://nubolab-ffwd.github.io/svelte-fluent/
+Documentation can be found at https://svelte-fluent-v2-preview.netlify.app/
 
 ## Example