Docs redesign (#728)

* Adding a dark mode
* Adding reference for types to summary pages
* Adding API Reference
* Adding modifiers to methods/fields/etc
* Minimizing files input
* Caching a lot of the output pages
* Cache only for each execution
* Adding API references to existing docs

examples/Cli/Demo/Commands/Add/AddPackageCommand.cs

@@ -2,7 +2,7 @@ using System.ComponentModel;
 using Demo.Utilities;
 using Spectre.Console.Cli;
 
-namespace Demo.Commands;
+namespace Demo.Commands.Add;
 
 [Description("Add a NuGet package reference to the project.")]
 public sealed class AddPackageCommand : Command<AddPackageCommand.Settings>