remove fat images and make PWA payload smaller

_config.yml

@@ -155,9 +155,9 @@ pwa:
   precache_glob_directory: / # Optional
   precache_glob_patterns: # Optional
     - "assets/{js,css,fonts}/**/*.{js,css,eot,svg,ttf,woff,png,jpg,jpeg}"
-    - "videos/*{mp4,webm}"
-    - "images/**/*.{jpg,png,jpeg}"
-    - "assets/albums/**/*.{mp3,jpeg}"
+#    - "videos/*{mp4,webm}"
+    - "images/**/*.{svg}"
+#    - "assets/albums/**/*.{mp3,jpeg}"
     - index.html
   precache_glob_ignores: # Optional
     - sw-register.js