fix remix docs

[alcpereira]

The current docs for Remix were containing some issues:

• The import is forced to http with @libsql/client/http, while I think it's better to let the environment import what it will need
• The environment variables were defined through AppLoadContext, but it's only recommended for a specific case of local development. I think recommending process.env and letting the user choose how to handle its type is generally better
• A small typo in the import of the turso client in app/routes/_index.tsx (buildDbClient instead of turso)
• A redundant type LoaderArgs which is deprecated (see here) and already covered by LoaderFunction (see below)

export type LoaderFunction = (args: LoaderFunctionArgs) => ReturnType<RRLoaderFunction>;

[notrab]

This is awesome, thank you 🙏