Provide clangd configuration pointing to public remote index

[i-ky]

It is documented how to point clangd to LLVM public remote index server. I am wondering if it would be possible to provide .clangd configuration file pointing to LLVM public remote index server as part of llvm/llvm-project. This way "batteries are included" and potential LLVM contributors can benefit from remote index as soon as source code is checked out, no extra configuration is needed.