Moved globalMetadata back to docfx.json

docs/all_globals.json

@@ -1,7 +0,0 @@
-{
-  "_enableSearch": true,
-  "_enableNewTab": true,
-  "_gitContribute": {
-    "apiSpecFolder": "docs/override"
-  }
-}

docs/docfx.json

@@ -53,7 +53,13 @@
     "template": [
       "default", "templates/material/material"
     ],
-    "globalMetadataFiles": ["all_globals.json"],
+    "globalMetadata": {
+      "_enableSearch": true,
+      "_enableNewTab": true,
+      "_gitContribute": {
+        "apiSpecFolder": "docs/override"
+      }
+    },
     "postProcessors": [],
     "markdownEngineName": "dfm",
     "noLangKeyword": false,