Update public facing docs

documentation/docs/05-modules.md

@@ -66,5 +66,5 @@ import { build, files, timestamp } from '$service-worker';
 ```
 
 - `build` is an array of URL strings representing the files generated by Vite, suitable for caching with `cache.addAll(build)`
-- `files` is an array of URL strings representing the files in your `static` directory, or whatever directory is specified by [`config.kit.files.assets`](#configuration)
+- `files` is an array of URL strings representing the files in your `static` directory, or whatever directory is specified by [`config.kit.files.assets`](#configuration). You can exclude certain files from `static` directory using [`config.kit.serviceWorker.filesExclusions`](#configuration)
 - `timestamp` is the result of calling `Date.now()` at build time. It's useful for generating unique cache names inside your service worker, so that a later deployment of your app can invalidate old caches

documentation/docs/14-configuration.md

@@ -25,6 +25,9 @@ const config = {
 			serviceWorker: 'src/service-worker',
 			template: 'src/app.html'
 		},
+		serviceWorker: {
+			filesExclusions: []
+		},
 		floc: false,
 		host: null,
 		hostHeader: null,
@@ -76,6 +79,12 @@ An object containing zero or more of the following `string` values:
 - `hooks` — the location of your hooks module (see [Hooks](#hooks))
 - `template` — the location of the template for HTML responses
 
+### serviceWorker
+
+An object containing zero or more of the following values:
+
+- `filesExclusions` - an array of glob patterns relative to `files.assets` dir. Files matching any of these would not be available in `$service-worker.files` e.g. if `files.assets` has value `static` then ['og-tags-images/**/*'] would match all files under `static/og-tags-images` dir.
+
 ### floc
 
 Google's [FLoC](https://github.com/WICG/floc) is a technology for targeted advertising that the [Electronic Frontier Foundation](https://www.eff.org/) has deemed [harmful](https://www.eff.org/deeplinks/2021/03/googles-floc-terrible-idea) to user privacy. [Browsers other than Chrome](https://www.theverge.com/2021/4/16/22387492/google-floc-ad-tech-privacy-browsers-brave-vivaldi-edge-mozilla-chrome-safari) have declined to implement it.