refactor: streamline favicon/icon set to match roux convention

SVG + favicon-32.png + apple-touch-icon.png (180) + icon-192/512.png.
Removes favicon.ico and redundant 16/48/96/180px named files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

layouts/partials/head.html

@@ -102,8 +102,7 @@
 />
 
 <!-- Favicon & PWA -->
-<link rel="icon" href="/favicon.svg" type="image/svg+xml" />
+<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
-<link rel="icon" href="/favicon.ico" sizes="16x16 32x32 48x48" type="image/x-icon" />
+<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png" />
-<link rel="icon" href="/icon-96.png" type="image/png" sizes="96x96" />
+<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
-<link rel="apple-touch-icon" href="/icon-180.png" sizes="180x180" />
 <link rel="manifest" href="/site.webmanifest" />

static/site.webmanifest

@@ -3,9 +3,11 @@
   "short_name": "Bar Pivoine",
   "description": "A field guide to the good pour.",
   "icons": [
-    { "src": "/icon-192.png", "type": "image/png", "sizes": "192x192" },
+    { "src": "/favicon-32.png",       "type": "image/png",     "sizes": "32x32"  },
-    { "src": "/icon-512.png", "type": "image/png", "sizes": "512x512" },
+    { "src": "/apple-touch-icon.png", "type": "image/png",     "sizes": "180x180" },
-    { "src": "/favicon.svg", "type": "image/svg+xml", "sizes": "any" }
+    { "src": "/icon-192.png",         "type": "image/png",     "sizes": "192x192" },
+    { "src": "/icon-512.png",         "type": "image/png",     "sizes": "512x512" },
+    { "src": "/favicon.svg",          "type": "image/svg+xml", "sizes": "any"     }
   ],
   "start_url": "/",
   "display": "standalone",