`wallet/wallet.json` is useless

[notimetoname]

With 61fd192 that wallet becomes as useful as any other just-generated wallet. None of make commands deposits on it, no container can be created with it, etc. But on the other hand it is still mentioned in README (and in doc dir too).
I would add a separate make target that replenishes wallet/wallet.json and add it as a prerequisite for any up command. @roman-khimov

[roman-khimov]

IIUC documentation mentions that a GAS transfer should be made, if you can make it easier to use -- OK.

[notimetoname]

IIUC documentation mentions that a GAS transfer should be made

@roman-khimov, updated the link(s). I read it as "do make prepare.ir and wallet/wallet.json is your door to the NeoFS". And that is how I used to use it.
Now it is just an empty wallet. Making a transfer to it means a user knows what neo-go is and how to use it. So I think we should either drop it or make it great (useful) again.
BTW, why neo-go needs a neofs balance? I think smth is wrong here.

[cthulhu-rider]

being a DevEnv user, i'd appreciate having both fixed "zero" wallet and the "one with some deposit sufficient for ~80% needs" from the box, e.g.:

• wallets/wallet.json with deposit
• wallets/wallet_other.json empty
  or vice-versa wallets/wallet.json and wallets/wallet_funded.json

[roman-khimov]

wallets/wallet.json with GAS and wallets/wallet_empty.json without GAS is a nice combination.