Fix broken URLs to Nexa spec

Jørgen S. Notlandrequested to merge
jQrgen/nexawebtemplate:fixurls into main

The links to the Nexa spec were broken.

The testnet faucet is an excellent way to show many practical capabilities Nexa has for developers. When the links are broken, it gives the impression that Nexa tools are not maintained

This MR fixes the broken links to the spec and updates Wally to include iOS and link to wallywallet.org

Edited by Jørgen S. Notland

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