Order 5.0 Upgrade Guide before 5.0 Migration Guide in sidebar

Match the index page order and reflect the logical flow: run the
upgrade process first, then consult per-version migration changes.

Author: dereuromark

.vitepress/toc_en.json

@@ -65,14 +65,14 @@
               "text": "Upgrading CakePHP",
               "link": "/appendices/migration-guides"
             },
-            {
-              "text": "5.0 Migration Guide",
-              "link": "/appendices/5-0-migration-guide"
-            },
             {
               "text": "5.0 Upgrade Guide",
               "link": "/appendices/5-0-upgrade-guide"
             },
+            {
+              "text": "5.0 Migration Guide",
+              "link": "/appendices/5-0-migration-guide"
+            },
             {
               "text": "5.1 Migration Guide",
               "link": "/appendices/5-1-migration-guide"

.vitepress/toc_ja.json

@@ -462,14 +462,14 @@
               "text": "移行ガイド",
               "link": "/ja/appendices/migration-guides"
             },
-            {
-              "text": "5.0 移行ガイド",
-              "link": "/ja/appendices/5-0-migration-guide"
-            },
             {
               "text": "5.0 アップグレードガイド",
               "link": "/ja/appendices/5-0-upgrade-guide"
             },
+            {
+              "text": "5.0 移行ガイド",
+              "link": "/ja/appendices/5-0-migration-guide"
+            },
             {
               "text": "5.1 移行ガイド",
               "link": "/ja/appendices/5-1-migration-guide"