Merge branch 'sw-favicon' into 'develop'

Don't serve favicon.png with ServiceWorker

See merge request soapbox-pub/soapbox!2042

webpack/production.ts

@@ -133,6 +133,7 @@ const configuration: Configuration = {
             '/unsubscribe',
             '/images',
             '/favicon.ico',
+            '/favicon.png',
             '/apple-touch-icon.png',
             '/browserconfig.xml',
             '/robots.txt',