tweake PWA

HISTORY.md

@@ -52,6 +52,7 @@
 * updated service worker to cache bbtSnapExtension.js
 * pwa versioning & cache-busting mechanism 
 * changed PWA icon to Alonzo
+* tweaked PWA
 
 ### 2021-10-26
 * objects: don't show codification and js-func blocks in search results unless enabled

manifest.json

@@ -34,10 +34,6 @@
       "src": "img/snap-icon-256.png",
       "sizes": "256x256",
       "type": "image/png"
-    }, {
-      "src": "img/snap-icon-384.png",
-      "sizes": "256x256",
-      "type": "image/png"
     }, {
       "src": "img/snap-icon-512.png",
       "sizes": "512x512",