Add prettier to vercel-tutor (#1058)

### Description

Adds prettier to `vercel-tutor`.

### Type of Change

- [ ] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [x] Other (changes to the codebase, but not to examples)

Author: chibicode

vercel-tutor/.prettierrc

@@ -0,0 +1,5 @@
+{
+  "trailingComma": "all",
+  "singleQuote": false,
+  "semi": true
+}

vercel-tutor/app/page.tsx

@@ -83,7 +83,7 @@ export default function Home() {
               }
             }}
           >
-            {isLoading ? 'Loading…' : 'View Pull Request'}
+            {isLoading ? "Loading…" : "View Pull Request"}
           </a>
           <a
             className="font-[family-name:var(--font-geist-sans)] text-secondary hover:underline flex items-center justify-center h-12 font-medium"

vercel-tutor/app/smaller-triangle.tsx

@@ -128,7 +128,7 @@ export default function Home() {
               }
             }}
           >
-            {isLoading ? 'Loading…' : 'Push Commit and Merge Pull Request'}
+            {isLoading ? "Loading…" : "Push Commit and Merge Pull Request"}
           </a>
           <a
             className="font-[family-name:var(--font-geist-sans)] text-secondary hover:underline flex items-center justify-center h-12 font-medium"

vercel-tutor/package.json

@@ -20,6 +20,7 @@
     "eslint": "^9",
     "eslint-config-next": "15.1.3",
     "postcss": "^8",
+    "prettier": "^3.4.2",
     "tailwindcss": "^3.4.1",
     "typescript": "^5"
   }