use `dfx nns install` instead of local deployment of ledger

[letmejustputthishere]

https://internetcomputer.org/docs/current/references/cli-reference/dfx-nns#dfx-nns-install

[ZenVoich]

dfx nns install returns a very strange error:

Error: Failed to install NNS components.
Caused by: Failed to install NNS components.
  Failed to verify that the local replica type is 'system'.
    The replica subnet_type needs to be 'system' to run NNS canisters. Current value: Ok(Application).

             You can configure it by setting local.replica.subnet_type to "system" in your global networks.json:

             1) Create or edit: /home/zen/.config/dfx/networks.json
             2) Set the local config to:
                 {
                   "local": {
                     "bind": "127.0.0.1:8080",
                     "type": "ephemeral",
                     "replica": {
                       "subnet_type": "application"
                     }
                   }
                 }
             3) Verify that you have no network configurations in dfx.json.
             4) Restart dfx:
                 dfx stop
                 dfx start --clean

dfx.json:

  "defaults": {
    "replica": {
      "subnet_type": "system"
    }
  },

networks.json: {}

---

We also have to take a few extra steps to send tokens to a local wallet https://forum.dfinity.org/t/dfx-nns-install-ledger-balance-0n/17776

[ZenVoich]

Oops, sorry, didn't notice it wasn't assigned to me. @letmejustputthishere