fix: Remove unused files

sw.js

@@ -1,11 +1,11 @@
 // Bump VERSION whenever a shell file changes. New versions wait for approval.
-const VERSION = 'v6';
+const VERSION = 'v7';
 const BASE = self.registration.scope;
 const PREFIX = `ascii-pwa-${encodeURIComponent(BASE)}-`;
 const CACHE = `${PREFIX}${VERSION}`;
 const SHELL = [
     './', './index.html', './style.css', './appearance.js', './app.js',
-    './renderer.js', './bitmap.js', './font-catalog.js', './vendor/figlet.js',
+    './renderer.js', './font-catalog.js', './vendor/figlet.js',
     './translations.js', './pwa.js', './manifest.webmanifest',
     './fonts/IBMPlexMono-Regular.subset.woff2',
     './fonts/IBMPlexMono-Bold.subset.woff2',