Restructure documentation layout

docs/guides/commands/samples/groups.cs

@@ -0,0 +1,18 @@
+[Group("admin")]
+public class AdminModule : ModuleBase
+{
+    [Group("clean")]
+    public class CleanModule : ModuleBase
+    {
+        // ~admin clean 15
+        [Command]
+        public async Task Default(int count = 10) => Messages(count);
+
+        // ~admin clean messages 15
+        [Command("messages")]
+        public async Task Messages(int count = 10) { }
+    }
+    // ~admin ban foxbot#0282
+    [Command("ban")]
+    public async Task Ban(IGuildUser user) { }
+}