The old guide has been offline for some time. U/Joohansson on Reddit decided to make a copy from an archived version, update it with the latest instructions and publish on Medium instead. He intends to keep it up to date and Medium has generally better availability.
Another alternative for the use of Nano and the Ledger is https://app.magnumwallet.co/
But there is no guide for it yet. Does anyone want to write it?