documentation: update Wallets file

[htteot]

What does this PR do?

Fixes #<ISSUE_NUMBER>

This PR introduces/refactors/...

Checklist before merging

• Install pre-commit and initialize it: pip install pre-commit, then pre-commit install. Pre-commit installs git hooks that automatically check the codebase. If pre-commit fails when you commit your changes, please fix the problems it points out.

[KoalaSat]

Hi! Can you expose here the reasons to remove those wallets? Just to keep track of it

[htteot]

Wallets Mutiny and Phoenix have been removed due to:

• Mutiny:
  -- wallet shutdown and the end of support:
  --- https://blog.mutinywallet.com/mutiny-wallet-is-shutting-down/

• Phoenix:
  -- wallet team does not want to support the lock invoice used by Robosats:
  --- chat conversation: "Hello, Locking payments is a hack that puts strain on the network. Phoenix won't allow unreasonably high lock time. But if the lock time is reasonable, then it should work. Best, Phoenix support"
  ---- Based on the tests, all transactions using this wallet failed in Robosats so I am removing this wallet. Waiting for their policy to change before adding it back.

[KoalaSat]

Wallets Mutiny and Phoenix have been removed due to:

• Mutiny:
  -- wallet shutdown and the end of support:
  --- https://blog.mutinywallet.com/mutiny-wallet-is-shutting-down/
• Phoenix:
  -- wallet team does not want to support the lock invoice used by Robosats:
  --- chat conversation: "Hello, Locking payments is a hack that puts strain on the network. Phoenix won't allow unreasonably high lock time. But if the lock time is reasonable, then it should work. Best, Phoenix support"
  ---- Based on the tests, all transactions using this wallet failed in Robosats so I am removing this wallet. Waiting for their policy to change before adding it back.

I see now. I agree on removing Mutiny if the wallet is shutting down. But that's not the case of Phoenix so people will continue trying to use it for Robosats, I think that we should just update the row instead or removing it. What do you think?

[htteot]

I agree

[htteot]

I have also updated logics.py file to replace string 'RoboSats' with string 'the trading platform'.
This is to increase the privacy and make surveillance a bit less easy.
Currently every transaction contains a reference to RoboSats platform exposing what the user of the Lightning wallet is doing.
This data can be potentially collected by the Lightning wallet operator or Lightning liquidity providers.