Hub page top installation should be changed

[NicolasPA]

https://hub.getdbt.com/dbt-msft/tsql_utils/latest/

The top of the hub page contains a default package installation configuration that is insufficient as described by the README instructions https://github.com/dbt-msft/tsql-utils#installation-instructions.

To reduce confusion for newcomers, I suggest modifying this Hub page so the top "Installation" part equals the README instruction.