Update web app manifest and favicon images

- Modified site.webmanifest to change the name and short_name to "MyWebSite" and "MySite" respectively.
- Updated icon sources to point to new favicon images.
- Set theme_color to white and display mode to standalone.
- Added purpose attribute for maskable icons.
- Replaced existing favicon images with new versions for 192x192 and 512x512 sizes.

Signed-off-by: wangsimiao1 <wangsimiao1@xiaomi.com>

Author: WangSimiao2000

assets/img/favicons/apple-touch-icon.png

@@ -1,26 +1,21 @@
----
-layout: compress
----
-
-{% assign favicon_path = "/assets/img/favicons" | relative_url %}
-
 {
-  "name": "{{ site.title }}",
-  "short_name": "{{ site.title }}",
-  "description": "{{ site.description }}",
+  "name": "MyWebSite",
+  "short_name": "MySite",
   "icons": [
     {
-      "src": "{{ favicon_path }}/android-chrome-192x192.png",
+      "src": "/web-app-manifest-192x192.png",
       "sizes": "192x192",
-      "type": "image/png"
+      "type": "image/png",
+      "purpose": "maskable"
     },
     {
-      "src": "{{ favicon_path }}/android-chrome-512x512.png",
+      "src": "/web-app-manifest-512x512.png",
       "sizes": "512x512",
-      "type": "image/png"
-    }],
-  "start_url": "{{ '/index.html' | relative_url }}",
-  "theme_color": "#2a1e6b",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "theme_color": "#ffffff",
   "background_color": "#ffffff",
-  "display": "fullscreen"
-}
+  "display": "standalone"
+}