Refactor: Migrate from Retrofit to Ktor

This commit migrates the network layer from Retrofit to Ktor.

Specific changes include:

- Replaced Retrofit
 with Ktor for network requests.
- Updated dependencies to include Ktor libraries.
- Refactored network service and data classes to use Ktor's API.
- Removed Retrofit-specific code and dependencies.
- Adjusted network module to provide Ktor client and services.
- Updated PixabayImageRepository
 to use the new Ktor-based PixabayService.

feature/details/src/main/kotlin/dev/adriankuta/pixabay/feature/details/PhotoDetailRoute.kt

@@ -39,7 +39,6 @@ import dev.adriankuta.pixabay.feature.details.di.PhotoDetailsViewModelFactory
 @Composable
 fun PhotoDetailRoute(
     photoId: Int,
-    onBack: () -> Unit,
     modifier: Modifier = Modifier,
     viewModel: PhotoDetailViewModel = hiltViewModel(
         creationCallback = { factory: PhotoDetailsViewModelFactory ->