Use local copy of workbox service worker scripts (#1358)

* Use local copy of workbox service worker scripts

* Refactor workbox integration:

- Only add prod js, without maps. Reduces the size from 170k to 24k
- Removed it from build. As it is small now, we can add it to source, and have a script to just update it whenever it is required
- Fixed relative paths in navidrome-service-worker.js, should now work with BaseUrl != ''

Co-authored-by: Deluan <deluan@navidrome.org>

ui/public/navidrome-service-worker.js

@@ -1,5 +1,10 @@
 // documentation: https://developers.google.com/web/tools/workbox/modules/workbox-sw
-importScripts("https://storage.googleapis.com/workbox-cdn/releases/6.1.2/workbox-sw.js");
+importScripts('3rdparty/workbox/workbox-sw.js')
+
+workbox.setConfig({
+  modulePathPrefix: '3rdparty/workbox/',
+  debug: false,
+})
 
 workbox.loadModule('workbox-core');
 workbox.loadModule('workbox-strategies');