Add SSFangTangTi for better Chinese characters rendering

src/App.jsx

@@ -86,7 +86,7 @@ function App() {
         img.width * ratio,
         img.height * ratio
       );
-      ctx.font = `${fontSize}px YurukaStd`;
+      ctx.font = `${fontSize}px YurukaStd, SSFangTangTi`;
       ctx.lineWidth = 9;
       ctx.save();
 

src/index.css

@@ -7,4 +7,9 @@ body {
 @font-face {
   font-family: 'YurukaStd';
   src: local('YurukaStd'), url(./fonts/YurukaStd.woff2) format('woff2');
+}
+
+@font-face {
+  font-family: 'SSFangTangTi';
+  src: local('SSFangTangTi'), url(./fonts/ShangShouFangTangTi.woff2) format('woff2');
 }