Update docfx.json

Author: lph-hhh

team_project/Documentation/docfx.json

@@ -31,7 +31,8 @@
         "_appStyle": "#navbar { display: none !important; }",
         "globalMetadata": {
             "_appTitle": "SUSTech Racing Car Documentation",
-            "_appFooter": "Generated by DocFX"       
+            "_appFooter": "Generated by DocFX",
+             "_enableSearch": true
         },
         "content": [
             {
@@ -60,4 +61,4 @@
         "dest": "../_site",
         "homepage": "toc.html"
     }
-}
+}