Implement swanky config for settings

[vikiival]

this is how swanky.config.json looks like

{
  "accounts": [
    {
      "alias": "alice",
      "mnemonic": "//Alice",
      "isDev": true,
      "address": "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY"
    },
    {
      "alias": "bob",
      "mnemonic": "//Bob",
      "isDev": true,
      "address": "5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty"
    }
  ],
  "contracts": {
    "psp22": {
      "name": "psp22",
      "deployments": [],
      "language": "ink"
    }
  },
  "networks": {
    "local": {
      "url": "ws://127.0.0.1:9944"
    },
    "astar": {
      "url": "wss://rpc.astar.network"
    },
    "shiden": {
      "url": "wss://rpc.shiden.astar.network"
    },
    "shibuya": {
      "url": "wss://rpc.shibuya.astar.network"
    }
  }
}

this is task to load this config in /settings

• where there would be dropdown to select which node you would like to connect