dashboard: toml editor

[dbarrosop]

Add a raw toml editor for the configuration.

To get the config:

query {
  configRawJSON(appID: "3bd3a7d5-839d-447b-9eb0-5905b96cc60b", resolve: false)
}

To send it back:

mutation ReplaceConfig($config: ConfigConfigInsertInput!) {
  replaceConfig(appID: "3bd3a7d5-839d-447b-9eb0-5905b96cc60b", config: $config) {
    __typename
  }
}

then as variables:

{
   "config": the-json-with-the-config-goes-here
}