Restructure documentation layout

docs/guides/commands/samples/dependency_module.cs

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+using Discord;
+using Discord.Commands;
+using Discord.WebSocket;
+
+public class ModuleA : ModuleBase
+{
+    private readonly DatabaseService _database;
+
+    // Dependencies can be injected via the constructor
+    public ModuleA(DatabaseService database)
+    {
+        _database = database;
+    }
+
+    public async Task ReadFromDb()
+    {
+        var x = _database.getX();
+        await ReplyAsync(x);
+    }
+}
+
+public class ModuleB
+{
+
+    // Public settable properties will be injected
+    public AnnounceService { get; set; }
+
+    // Public properties without setters will not
+    public CommandService Commands { get; }
+
+    // Public properties annotated with [DontInject] will not
+    [DontInject]
+    public NotificationService { get; set; }
+
+    public ModuleB(CommandService commands)
+    {
+        Commands = commands;
+    }
+
+}