Improve status of current Guide

[koletzilla]

As part of the improvements, we want to also update our guide. Adding this issue in case someone wants to contribute with more ideas.

Current guide: https://clickhouse.com/docs/integrations/dbt/guides

Changes to be done:

• Update dbt init to use proper models that are representatives of the usage of this adapter. Users shouldn't need to recreate everything to get started.
• Update the guide to use, if possible, https://github.com/dbt-labs/jaffle-shop.

Any ideas/contributions are more than welcome!