Refactor and/or improve web UI code

[ramonvermeulen]

Web UI code (especially in Home.tsx) can have some improvements, try to find a way to implement an ORM in combination with duckdb if this is possible, so we don't have to write plain text SQL queries. Looking for something similar to https://sequelize.org/ however with duckdb-(wasm) support.

For the rest I think the code of state handling can be improved, and some of the logic can maybe be moved into hooks.