Delete command, install only database

[kentico-ericd]

Motivation

• Adds delete command which drops the database, deletes project files, and deletes the profile
• Adds a new option to InstallCommand to use an existing database
• Adds db parameter to InstallCommand to only install database
• Adds icon and repository link to NuGet package
• Fixes macro command not allowing old and new salt simultaneously
• Fixes repository link in HelpCommand

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

⚠️ Note: Tests for DeleteCommand and new db parameter cannot be tested, as they require user input and do not use a wizard.