[docs] highlight marketable features (#2959)

documentation/docs/00-introduction.md

@@ -14,7 +14,7 @@ SvelteKit is a framework for building extremely high-performance web apps.
 
 Building an app with all the modern best practices is fiendishly complicated. Those practices include [build optimizations](https://vitejs.dev/guide/features.html#build-optimizations), so that you load only the minimal required code; [offline support](#service-workers); [prefetching](#anchor-options-sveltekit-prefetch) pages before the user initiates navigation; and [configurable rendering](#ssr-and-javascript) that allows you to generate HTML [on the server](#ssr-and-javascript-ssr) or [in the browser](#ssr-and-javascript-router) at runtime or [at build-time](#ssr-and-javascript-prerender). SvelteKit does all the boring stuff for you so that you can get on with the creative part.
 
-It uses [Vite](https://vitejs.dev/) with a [Svelte plugin](https://github.com/sveltejs/vite-plugin-svelte) to provide a lightning-fast and feature-rich development experience, where changes to your code are reflected in the browser immediately.
+It uses [Vite](https://vitejs.dev/) with a [Svelte plugin](https://github.com/sveltejs/vite-plugin-svelte) to provide a lightning-fast and feature-rich development experience with [Hot Module Replacement (HMR)](https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/config.md#hot), where changes to your code are reflected in the browser instantly.
 
 You don't need to know Svelte to understand the rest of this guide, but it will help. In short, it's a UI framework that compiles your components to highly optimized vanilla JavaScript. Read the [introduction to Svelte blog post](https://svelte.dev/blog/svelte-3-rethinking-reactivity) and the [Svelte tutorial](https://svelte.dev/tutorial) to learn more.
 
@@ -36,4 +36,8 @@ There are two basic concepts:
 - Each page of your app is a [Svelte](https://svelte.dev) component
 - You create pages by adding files to the `src/routes` directory of your project. These will be server-rendered so that a user's first visit to your app is as fast as possible, then a client-side app takes over
 
-Try editing the files to get a feel for how everything works – you may not need to bother reading the rest of this guide! We recommend using [Visual Studio Code (aka VS Code)](https://code.visualstudio.com/download) with [the Svelte extension](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode), but [support also exists for numerous other editors](https://sveltesociety.dev/tools#editor-support).
+Try editing the files to get a feel for how everything works – you may not need to bother reading the rest of this guide!
+
+#### Editor setup
+
+We recommend using [Visual Studio Code (aka VS Code)](https://code.visualstudio.com/download) with [the Svelte extension](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode), but [support also exists for numerous other editors](https://sveltesociety.dev/tools#editor-support).

documentation/docs/14-configuration.md

@@ -221,4 +221,4 @@ Whether to remove, append, or ignore trailing slashes when resolving URLs to rou
 
 ### vite
 
-A [Vite config object](https://vitejs.dev/config), or a function that returns one. Not all configuration options can be set, since SvelteKit depends on certain values being configured internally.
+A [Vite config object](https://vitejs.dev/config), or a function that returns one. You can pass [Vite and Rollup plugins](https://github.com/vitejs/awesome-vite#plugins) via [the `plugins` option](https://vitejs.dev/config/#plugins) to customize your build in advanced ways such as supporting image optimization, Tauri, WASM, Workbox, and more. SvelteKit will prevent you from setting certain build-related options since it depends on certain configuration values.

documentation/docs/90-additional-resources.md

@@ -19,7 +19,7 @@ We've written and published a few different SvelteKit sites as examples:
 
 ### Integrations
 
-[`svelte-preprocess`](https://github.com/sveltejs/svelte-preprocess) allows you to automatically transform the code in your Svelte templates provides support for TypeScript, PostCSS, scss/sass, Less, and many other technologies. The first step of setting it up is to add `svelte-preprocess` to your [`svelte.config.js`](#configuration). It is provided by the template if you're using TypeScript whereas JavaScript users will need to add it. After that, you will often only need to install the corresponding library such as `npm install -D sass`or `npm install -D less`. See the [`svelte-preprocess`](https://github.com/sveltejs/svelte-preprocess) docs for more details.
+[`svelte-preprocess`](https://github.com/sveltejs/svelte-preprocess) automatically transforms the code in your Svelte templates to provide support for TypeScript, PostCSS, scss/sass, Less, and many other technologies. The first step of setting it up is to add `svelte-preprocess` to your [`svelte.config.js`](#configuration). It is provided by the template if you're using TypeScript whereas JavaScript users will need to add it. After that, you will often only need to install the corresponding library such as `npm install -D sass`or `npm install -D less`. See the [`svelte-preprocess`](https://github.com/sveltejs/svelte-preprocess) docs for more details.
 
 [Svelte Adders](https://sveltesociety.dev/templates#adders) allow you to setup many different complex integrations like Tailwind, PostCSS, Firebase, GraphQL, mdsvex, and more with a single command. Please see [sveltesociety.dev](https://sveltesociety.dev/) for a full listing of templates, components, and tools available for use with Svelte and SvelteKit.