sonarqube benefits of default rules, and making best practices clearer

[dlavender4]

Feedback from bs-select team.

I've made the best-practices clearer. I've pointed out the MAIN benefit of using sonar default rules is that they are auto-updated and ongoingly curated by the SonarQube team. I've trimmed the page down a bit - team thought the rest of the info is available on sonarqube's page anyway - fair point. So have kept this as mostly a best-practices page.

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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