Major updates to rule about version control for Power BI

[divgul]

1. What triggered this change? (PBI link, Email Subject, conversation + reason, etc)

✏️Adam reviewed the original rule and gave feedback

2. What was changed?

✏️Rule - https://www.ssw.com.au/rules/do-you-use-version-control-with-power-bi/

• Re-wrote the introduction to show the drawbacks of directly publishing reports into Power BI Service
• Showed benefits of converting reports to the PBIP format before committing them to version control
• Re-structured the section that describes foundational concepts

3. Did you do pair or mob programming (list names)?

✏️No, but did get good feedback from @adamcogan and @uly1

[github-actions]

Howzit @divgul,

This PR has been here a while.

Did you know you should avoid merge debt?

1. Please action (e.g. get a review) and merge or close

Thanks!