Add 1.x Engine docs

Author: willeastcott

index.html

@@ -619,10 +619,20 @@
             text-decoration: none;
             border-radius: 4px;
             transition: background-color 0.2s;
+            margin-right: 8px;
+            width: 140px;
+            text-align: center;
+            margin-bottom: 8px;
+        }
+
+        .module-link.legacy {
+            background-color: rgba(77, 166, 255, 0.3);
+            color: rgba(255, 255, 255, 0.8);
         }
 
-        html[data-theme="light"] .module-link {
-            background-color: var(--light-color-link);
+        html[data-theme="light"] .module-link.legacy {
+            background-color: rgba(0, 102, 204, 0.3);
+            color: rgba(0, 0, 0, 0.6);
         }
 
         .module-link:hover {
@@ -773,7 +783,8 @@ <h2>Available API References</h2>
                             <li class="module-item" data-name="engine">
                                 <h3>📖 Engine</h3>
                                 <p>The core PlayCanvas engine featuring rendering, physics, animation, sound, and more.</p>
-                                <a href="./engine/" class="module-link">View API Reference</a>
+                                <a href="./engine/" class="module-link">v2.x API (current)</a>
+                                <a href="./engine-v1/" class="module-link legacy">v1.x API (legacy)</a>
                             </li>
                             <li class="module-item" data-name="web-components">
                                 <h3>📖 Web Components</h3>

repos-config.json

@@ -5,6 +5,11 @@
       "url": "https://github.com/playcanvas/engine.git",
       "branch": "release-2.6"
     },
+    {
+      "name": "engine-v1",
+      "url": "https://github.com/playcanvas/engine.git",
+      "branch": "release-1.77"
+    },
     {
       "name": "pcui",
       "url": "https://github.com/playcanvas/pcui.git",