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/Console/Exceptions/Program.cs

@@ -3,8 +3,9 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Security.Authentication;
 using System.Threading.Tasks;
+using Spectre.Console;
 
-namespace Spectre.Console.Examples;
+namespace Exceptions;
 
 public static class Program
 {