Sync kit docs (#1151)

sync kit docs

Co-authored-by: svelte-docs-bot[bot] <196124396+svelte-docs-bot[bot]@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/kit/25-build-and-deploy/70-adapter-cloudflare-workers.md

@@ -134,7 +134,7 @@ For testing the build, you should use [wrangler](https://developers.cloudflare.c
 
 ### Worker size limits
 
-When deploying to workers, the server generated by SvelteKit is bundled into a single file. Wrangler will fail to publish your worker if it exceeds [the size limits](https://developers.cloudflare.com/workers/platform/limits/#worker-size) after minification. You're unlikely to hit this limit usually, but some large libraries can cause this to happen. In that case, you can try to reduce the size of your worker by only importing such libraries on the client side. See [the FAQ](./faq#How-do-I-use-X-with-SvelteKit-How-do-I-use-a-client-side-only-library-that-depends-on-document-or-window) for more information.
+When deploying to workers, the server generated by SvelteKit is bundled into a single file. Wrangler will fail to publish your worker if it exceeds [the size limits](https://developers.cloudflare.com/workers/platform/limits/#worker-size) after minification. You're unlikely to hit this limit usually, but some large libraries can cause this to happen. In that case, you can try to reduce the size of your worker by only importing such libraries on the client side. See [the FAQ](./faq#How-do-I-use-a-client-side-library-accessing-document-or-window) for more information.
 
 ### Accessing the file system
 

apps/svelte.dev/content/docs/kit/40-best-practices/07-images.md

@@ -153,6 +153,12 @@ Using a content delivery network (CDN) can allow you to optimize these images dy
 
 CDNs can generally be used without any need for a library. However, there are a number of libraries with Svelte support that make it easier. [`@unpic/svelte`](https://unpic.pics/img/svelte/) is a CDN-agnostic library with support for a large number of providers. You may also find that specific CDNs like [Cloudinary](https://svelte.cloudinary.dev/) have Svelte support. Finally, some content management systems (CMS) which support Svelte (such as [Contentful](https://www.contentful.com/sveltekit-starter-guide/), [Storyblok](https://github.com/storyblok/storyblok-svelte), and [Contentstack](https://www.contentstack.com/docs/developers/sample-apps/build-a-starter-website-with-sveltekit-and-contentstack)) have built-in support for image handling.
 
+## Icons
+
+A great way to use icons is to define them purely in CSS. Iconify offers a huge set of icons [available via CSS](https://iconify.design/docs/usage/css/).
+
+For icons defined in `.svelte` files, it is recommended to avoid libraries that provide a `.svelte` file per icon. These libraries can have thousands of `.svelte` files which really slow down Vite's dependency optimization. This can become especially pathological if the icons are imported both via an umbrella import and subpath import [as described in the `vite-plugin-svelte` FAQ](https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/faq.md#what-is-going-on-with-vite-and-pre-bundling-dependencies).
+
 ## Best practices
 
 - For each image type, use the appropriate solution from those discussed above. You can mix and match all three solutions in one project. For example, you may use Vite's built-in handling to provide images for `<meta>` tags, display images on your homepage with `@sveltejs/enhanced-img`, and display user-submitted content with a dynamic approach.

apps/svelte.dev/content/docs/kit/60-appendix/10-faq.md

@@ -60,7 +60,7 @@ Libraries work best in the browser with Vite when they distribute an ESM version
 
 If you are still encountering issues we recommend searching both [the Vite issue tracker](https://github.com/vitejs/vite/issues) and the issue tracker of the library in question. Sometimes issues can be worked around by fiddling with the [`optimizeDeps`](https://vitejs.dev/config/#dep-optimization-options) or [`ssr`](https://vitejs.dev/config/#ssr-options) config values though we recommend this as only a short-term workaround in favor of fixing the library in question.
 
-## How do I use the view transitions API with SvelteKit?
+## How do I use the view transitions API?
 
 While SvelteKit does not have any specific integration with [view transitions](https://developer.chrome.com/docs/web-platform/view-transitions/), you can call `document.startViewTransition` in [`onNavigate`]($app-navigation#onNavigate) to trigger a view transition on every client-side navigation.
 
@@ -82,15 +82,13 @@ onNavigate((navigation) => {
 
 For more, see ["Unlocking view transitions"](/blog/view-transitions) on the Svelte blog.
 
-## How do I use X with SvelteKit?
-
-Make sure you've read the [documentation section on integrations](./integrations). If you're still having trouble, solutions to common issues are listed below.
-
-### How do I setup a database?
+## How do I set up a database?
 
 Put the code to query your database in a [server route](./routing#server) - don't query the database in .svelte files. You can create a `db.js` or similar that sets up a connection immediately and makes the client accessible throughout the app as a singleton. You can execute any one-time setup code in `hooks.server.js` and import your database helpers into any endpoint that needs them.
 
-### How do I use a client-side only library that depends on `document` or `window`?
+You can use [the Svelte CLI](/docs/cli/overview) to automatically set up database integrations.
+
+## How do I use a client-side library accessing `document` or `window`?
 
 If you need access to the `document` or `window` variables or otherwise need code to run only on the client-side you can wrap it in a `browser` check:
 
@@ -158,7 +156,7 @@ Finally, you may also consider using an `{#await}` block:
 {/await}
 ```
 
-### How do I use a different backend API server?
+## How do I use a different backend API server?
 
 You can use [`event.fetch`](./load#Making-fetch-requests) to request data from an external API server, but be aware that you would need to deal with [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS), which will result in complications such as generally requiring requests to be preflighted resulting in higher latency. Requests to a separate subdomain may also increase latency due to an additional DNS lookup, TLS setup, etc. If you wish to use this method, you may find [`handleFetch`](./hooks#Server-hooks-handleFetch) helpful.
 
@@ -176,7 +174,7 @@ export function GET({ params, url }) {
 
 (Note that you may also need to proxy `POST`/`PATCH` etc requests, and forward `request.headers`, depending on your needs.)
 
-### How do I use middleware?
+## How do I use middleware?
 
 `adapter-node` builds a middleware that you can use with your own server for production mode. In dev, you can add middleware to Vite by using a Vite plugin. For example:
 
@@ -210,6 +208,8 @@ export default config;
 
 See [Vite's `configureServer` docs](https://vitejs.dev/guide/api-plugin.html#configureserver) for more details including how to control ordering.
 
+## How do I use Yarn?
+
 ### Does it work with Yarn 2?
 
 Sort of. The Plug'n'Play feature, aka 'pnp', is broken (it deviates from the Node module resolution algorithm, and [doesn't yet work with native JavaScript modules](https://github.com/yarnpkg/berry/issues/638) which SvelteKit — along with an [increasing number of packages](https://blog.sindresorhus.com/get-ready-for-esm-aa53530b3f77) — uses). You can use `nodeLinker: 'node-modules'` in your [`.yarnrc.yml`](https://yarnpkg.com/configuration/yarnrc#nodeLinker) file to disable pnp, but it's probably easier to just use npm or [pnpm](https://pnpm.io/), which is similarly fast and efficient but without the compatibility headaches.

apps/svelte.dev/content/docs/kit/60-appendix/20-integrations.md

@@ -50,4 +50,4 @@ Since SvelteKit projects are built with Vite, you can use Vite plugins to enhanc
 
 ## Integration FAQs
 
-The SvelteKit FAQ has a [how to do X with SvelteKit](./faq#How-do-I-use-X-with-SvelteKit), which may be helpful if you still have questions.
+The SvelteKit FAQ has a [how to do X with SvelteKit](./faq#How-do-I-set-up-a-database), which may be helpful if you still have questions.

apps/svelte.dev/content/docs/kit/98-reference/[email protected]

@@ -2628,7 +2628,7 @@ type SubmitFunction<
 				reset?: boolean;
 				invalidateAll?: boolean;
 			}) => Promise<void>;
-	  }) => void)
+	  }) => MaybePromise<void>)
 >;
 ```