chore: update app name in manifest.json from "Pulse Analytics" to "Pulse" and change icon paths to new images with padding

public/manifest.json

@@ -1,5 +1,5 @@
 {
-  "name": "Pulse Analytics",
+  "name": "Pulse",
   "short_name": "Pulse",
   "description": "Privacy-friendly website analytics",
   "start_url": "/",
@@ -8,12 +8,12 @@
   "theme_color": "#000000",
   "icons": [
     {
-      "src": "/pulse_icon_no_margins.png",
+      "src": "/Icon%20Padding%20left%20%26%20right%20192x192.png",
       "sizes": "192x192",
       "type": "image/png"
     },
     {
-      "src": "/pulse_icon_no_margins.png",
+      "src": "/Icon%20Padding%20left%20%26%20right%20512x512.png",
       "sizes": "512x512",
       "type": "image/png"
     }