add favicons and meta tags for browser/bookmark support

logos/site.webmanifest

@@ -0,0 +1,20 @@
+{
+  "name": "calls24 — Анализ звонков",
+  "short_name": "calls24",
+  "description": "Автоматический анализ звонков за 24 часа",
+  "icons": [
+    {
+      "src": "/logos/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/logos/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "theme_color": "#22c55e",
+  "background_color": "#0a0a0a",
+  "display": "standalone"
+}