remove versioned ca cert endpoints

vpnweb has an versioned endpoint for ca certs: web.HttpFileHandler(srv, "/3/ca.crt", opts.ProviderCaPath)

I wonder if we really need them and tend to remove them. IIRC they are not in use in current clients. @meskio @kali Do you know more?

Edited Feb 23, 2021 by cyberta

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