Remove certain auto-generated pages from the site using the same filter for toc

[cjsha]

There are some auto-generated pages that are hidden from the toc, but they are still served on our website and can be found if you know what to search for. For example, DeviceNameConverter.

[cjsha]

hint:
https://dotnet.github.io/docfx/reference/docfx-json-reference.html#_noindex

but better yet, those pages just wouldn't be generated