Remove deprected options in snowpack config file

Author: jihchi

snowpack.config.js

@@ -1,8 +1,8 @@
 /** @type {import("snowpack").SnowpackUserConfig } */
 module.exports = {
   mount: {
-    public: {url: '/', static: true},
-    src: {url: '/dist'},
+    public: { url: '/', static: true },
+    src: { url: '/dist' },
   },
   plugins: [
     '@snowpack/plugin-react-refresh',
@@ -13,12 +13,9 @@ module.exports = {
         cmd: 'bsb -make-world',
         watch: '$1 -w',
       },
-    ]
+    ],
   ],
-  install: [
-    /* ... */
-  ],
-  installOptions: {
+  packageOptions: {
     /* ... */
   },
   devOptions: {