Add touchstone-tools link to dbt5 docs

[greysome]

In response to this issue.

[markwkm]

I think the description is a little too brief, such that it's misleading by not providing enough information. What would be better is to rewrite the following line too, so that all of those parts are explained better.

[greysome]

Would this be more accurate:
touchstone is a collection of scripts that are executed when dbt5-run is called with --profile or --stats. --profile calls ts profile which requires perf, while --stats calls ts sysstat which requires jq, sar and pidstat.

[markwkm]

Would this be more accurate: touchstone is a collection of scripts that are executed when dbt5-run is called with --profile or --stats. --profile calls ts profile which requires perf, while --stats calls ts sysstat which requires jq, sar and pidstat.

Yes, but too literal. I'll pondering over it more, if you don't have any other suggestions.