Update docfx (#265)

Author: cjsha

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "docfx": {
-      "version": "2.77.0",
+      "version": "2.78.3",
       "commands": [
         "docfx"
       ]

docfx.json

@@ -34,6 +34,8 @@
     "globalMetadata": {
       "_enableNewTab": true,
       "_enableSearch": true,
+      "_searchIndexUseMetadata": true,
+      "_searchIndexUseMetadataTitle": false,
       "pdf": false,
       "_appFooter": "&copy; Open Ephys and Contributors. Made with <a href=\"https://dotnet.github.io/docfx\">docfx</a>",
       "_appFaviconPath": "favicon.png",