`StarterKit:` Migrate AvaCloud API example webapp to use BuilderKit

Check out the [Web App Templates](https://github.com/ava-labs/avalanche-starter-kit/tree/main/web-apps/src/app) in the Avalanche Starter Kit to use the BuilderKit

Replace with official npm package

```
import { ICTT, PoweredByAvalanche, Web3Provider } from "@0xstt/builderkit";
```

`@avalabs/builderkit`
