chore: use svelte kit v1 (#326)

Author: ota-meshi

package.json

@@ -91,8 +91,8 @@
     "@fontsource/fira-mono": "^4.5.0",
     "@ota-meshi/eslint-plugin": "^0.13.0",
     "@sindresorhus/slugify": "^2.1.0",
-    "@sveltejs/adapter-static": "^1.0.0-next.40",
-    "@sveltejs/kit": "^1.0.0-next.456",
+    "@sveltejs/adapter-static": "^1.0.0",
+    "@sveltejs/kit": "^1.0.0",
     "@types/babel__core": "^7.1.19",
     "@types/cross-spawn": "^6.0.2",
     "@types/escape-html": "^1.0.2",