Update docfx.json

Author: Simonx Xu

Microsoft365/docfx.json

@@ -1,6 +1,24 @@
 {
   "build": {
     "content": [
+      {
+        "files": [
+          "**/*.md",
+          "**/*.yml"
+        ],
+        "exclude": [
+          "**/obj/**",
+          "**/includes/**",
+          "_themes/**",
+          "_themes.pdf/**",
+          "**/docfx.json",
+          "_repo.en-us/**",
+          "README.md",
+          "LICENSE",
+          "LICENSE-CODE",
+          "ThirdPartyNotices.md"
+        ]
+      },
       {
         "files": [
           "**/*.md",