add @vercel/speed-insights (#96)

package.json

@@ -23,6 +23,7 @@
     "@storybook/test": "^8.3.6",
     "@types/rss": "^0.0.32",
     "@vercel/analytics": "^1.3.2",
+    "@vercel/speed-insights": "^1.0.14",
     "cheerio": "^1.0.0",
     "highlight.js": "^11.10.0",
     "microcms-js-sdk": "^3.1.2",

yarn.lock

@@ -5167,6 +5167,33 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@vercel/speed-insights@npm:^1.0.14":
+  version: 1.0.14
+  resolution: "@vercel/speed-insights@npm:1.0.14"
+  peerDependencies:
+    "@sveltejs/kit": ^1 || ^2
+    next: ">= 13"
+    react: ^18 || ^19 || ^19.0.0-rc
+    svelte: ">= 4"
+    vue: ^3
+    vue-router: ^4
+  peerDependenciesMeta:
+    "@sveltejs/kit":
+      optional: true
+    next:
+      optional: true
+    react:
+      optional: true
+    svelte:
+      optional: true
+    vue:
+      optional: true
+    vue-router:
+      optional: true
+  checksum: c67007e87377cf579ec0fa1c0919a165a0b414c80ab418cb59e269f1b35d458cdc267e14643a5740bcc1ef9fb957b7e521dc097894f54cf5ce4e436b8acc075c
+  languageName: node
+  linkType: hard
+
 "@vercel/static-build@npm:2.5.33":
   version: 2.5.33
   resolution: "@vercel/static-build@npm:2.5.33"
@@ -12686,6 +12713,7 @@ __metadata:
     "@typescript-eslint/eslint-plugin": "npm:^8.11.0"
     "@typescript-eslint/parser": "npm:^8.11.0"
     "@vercel/analytics": "npm:^1.3.2"
+    "@vercel/speed-insights": "npm:^1.0.14"
     babel-loader: "npm:^9.2.1"
     cheerio: "npm:^1.0.0"
     chromatic: "npm:^11.16.1"