Change requests to a more generic `source` data to support static generation / browsing

We want to enable static data to be entered here if someone doesn't want to fetch APIs. Static data viewing?

So:
```js
const config = {
  keys: { ... },
  source: {
    get: {
      data: [
        { ...object that fits schema },
        { ...object that fits schema } 
      ]
    }
  }
}
```

Then when building, can statically create those objects