Walkthrough section in documentation

[mbkuhn]

Summary

Adding a walkthrough section to the documentation to clarify the typical workflow and usage recommendations associated with common AMR-Wind applications. Other documentation updates may be included here too.

Pull request type

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [x] Documentation content changes
• [ ] Other (please describe):