add laravel upgrade link

Author: kadirermantr

index.html

@@ -67,6 +67,11 @@ <h1 class="mt-5 text-5xl font-semibold text-gray-800">Laravel Upgrade Helper</h1
       <a :href="releaseLink" target="_blank" class="underline italic">link</a>
     </div>
 
+    <div class="text-center">
+      For upgrade guide see:
+      <a :href="guideLink" target="_blank" class="underline italic">link</a>
+    </div>
+
     <div class="text-center">
       Click <a :href="diffFileLink" download><b class="underline text-red">here</b></a>
       to download patch file.
@@ -205,6 +210,13 @@ <h3 class="text-xl font-semibold text-gray-900 dark:text-white">
         return 'https://github.com/laravel/laravel/releases/tag/' + this.upgradeVersion;
       },
 
+      guideLink() {
+        const majorVersion = this.upgradeVersion.split('.').pop();
+        const version = majorVersion >= 6 ? majorVersion + '.x' : this.upgradeVersion.split('.').slice(1, 3).join('.');
+
+        return 'https://laravel.com/docs/' + version + '/upgrade';
+      },
+
       diffFileLink() {
         return `diffs/${this.baseVersion}...${this.upgradeVersion}.diff`;
       },