Revise PesterPreference docs

[fflaten]

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Link to page

https://pester.dev/docs/usage/configuration#pesterpreference

What is the issue?

Update $PesterPreference section of configuration docs. It currently explains both Invoke-Pester and interactive execution (F5) while the example only works for the latter. Neither are very clear atm.

Related pester/Pester#2328

Suggested fix?

• Add section for interactive execution somewhere elsewhere (related Add usage page for invoking Pester #243)
• Focus on profile/default settings with $PesterPreference