Genesis: Add dedicated "cratedb-configs" page to upstream documentation

## About

Coming from https://github.com/dbt-labs/docs.getdbt.com/pull/6564#discussion_r1879222035, we should review our implementation, and then possibly add a dedicated cratedb-configs page, for example like [yellowbrick-configs](https://docs.getdbt.com/reference/resource-configs/yellowbrick-configs) is doing it, that educates readers about the fact CrateDB might only support a subset of the materialization strategies compared to what the PostgreSQL adapter provides per [postgres-configs](https://docs.getdbt.com/reference/resource-configs/postgres-configs).

## Workaround

For immediate application, we will do it like the [risingwave-setup](https://docs.getdbt.com/docs/core/connect-data-platform/risingwave-setup) page is doing it, by referring to the [no-configs](https://docs.getdbt.com/reference/resource-configs/no-configs) page, that says there are "no specific configurations for this adapter". By doing it this way, we can contribute a relevant page later, but sure enough it would be sweet to get it right and complete from the very beginning.