Create Onion alias url for torproject.org sites

Now that we have v3 onions in place, let's use memorable domains for torproject onions.

torproject.org -> torproject.tor.onion

blog.torproject.org -> blog.torproject.tor.onion

torproject.org/download -> torproject.tor.onion/download

Edited Jun 23, 2021 by Antonela

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