chore: upgrade svelte kit and migration work

Author: ota-meshi

explorer-v2/package.json

@@ -22,8 +22,8 @@
 		"svelte-eslint-parser": "link:.."
 	},
 	"devDependencies": {
-		"@sveltejs/adapter-static": "^1.0.0-next.13",
-		"@sveltejs/kit": "^1.0.0-next.428",
+		"@sveltejs/adapter-static": "^1.0.0-next.40",
+		"@sveltejs/kit": "^1.0.0-next.456",
 		"prettier": "^2.3.0",
 		"prettier-plugin-svelte": "^2.3.0",
 		"string-replace-loader": "^3.0.1",

explorer-v2/src/routes/+layout.js

@@ -0,0 +1 @@
+export const prerender = true;

explorer-v2/svelte.config.js

@@ -13,10 +13,7 @@ const config = {
 			pages: 'build',
 			assets: 'build',
 			fallback: null
-		}),
-		prerender: {
-			default: true
-		}
+		})
 	}
 };