Feature: Xperience v29.7.0 support, docs format, file cleanup

[seangwright]

Motivation

I was not able to generate the local database for the DancingGoat application, which was setup for v29.5.0.
When I replaced DancingGoat with a new v29.7.0 application I was able to generate the database so I'm sharing that code change.

• Support Xperience v29.7.0
• Remove developer environment setup settings from appsettings.json
• Run dotnet format on solution
• Ignore format and lint errors in DancingGoat project
• Remove old .gitkeep files
• Update non-Xperience NuGet packages to latest
• Update required Xperience version in README.md

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[Rumec]

Review OK -> Approved