update openjij tutorial page

Author: j-i-k-o

www/index.html

@@ -39,7 +39,7 @@ <h1 class="text-xl font-bold">OpenJij</h1>
                 <!-- デスクトップメニュー -->
                 <ul class="hidden md:flex space-x-4">
                     <li><a href="https://www.j-ij.com/" target="_blank" class="hover:underline">Jij Inc.</a></li>
-                    <li><a href="https://openjij.github.io/OpenJij/index.html" class="hover:underline">Documentation</a></li>
+                    <li><a href="https://jij-inc.github.io/OpenJij/index.html" class="hover:underline">Documentation</a></li>
                     <li><a href="https://discord.gg/Km5dKF9JjG" target="_blank" class="hover:underline flex items-center"><i
                                 class="fab fa-discord mr-2"></i>Community</a></li>
                     <li><a href="https://github.com/OpenJij/OpenJij" target="_blank"
@@ -57,7 +57,7 @@ <h1 class="text-xl font-bold">OpenJij</h1>
         <div id="mobile-menu" class="hidden md:hidden">
             <ul class="flex flex-col items-center space-y-4 mt-4">
                 <li><a href="https://www.j-ij.com/" target="_blank" class="hover:underline">Jij Inc.</a></li>
-                <li><a href="https://openjij.github.io/OpenJij/index.html" class="hover:underline">Documentation</a></li>
+                <li><a href="https://jij-inc.github.io/OpenJij/index.html" class="hover:underline">Documentation</a></li>
                 <li><a href="https://discord.gg/Km5dKF9JjG" target="_blank" class="hover:underline flex items-center"><i
                             class="fab fa-discord mr-2"></i>Community</a></li>
                 <li><a href="https://github.com/OpenJij/OpenJij" target="_blank"
@@ -152,7 +152,7 @@ <h3 class="text-3xl font-bold text-center mb-10">Documentation & Tutorials</h3>
                     OpenJij. Whether you're a student new to Ising optimization, a researcher, or a developer, we have something
                     for you.</p>
                 <div class="flex justify-center">
-                    <a href="https://openjij.github.io/OpenJij/index.html" target="_blank"
+                    <a href="https://jij-inc.github.io/OpenJij/index.html" target="_blank"
                         class="bg-red-500 hover:bg-red-600 text-white font-bold py-2 px-4 rounded transition-colors">View
                         Documentation</a>
                 </div>