Update explorers.html

[kzKallisti]

Add explorer.bch.ninja and alphabetize the list to minimize bias

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[imaginaryusername]

If we are adding individual instances of sickpig's RPC explorer, we should probably add the long standing https://bch.loping.net/ as well.

This page also needs a list of various testnet explorers... but that can wait for a separate PR.

[imaginaryusername]

Merging this and adding lopingnet next.

[imaginaryusername]

@kzKallisti can you align this to the latest master (where tokenview exists) so I can merge and close this