chore: refactor data fetching

[Sen-Com]

In its current state, the website fetches all data directly from the nodes to the clients. This leads to slow loading times and heavy node utilization. We should refactor this into a client-server architecture where the client only fetches the data it needs (balances, account address) and everything else (fuel assets, leaderboards) is fetched from the server. the server then refreshes it's cache every couple of minutes