Restructure documentation layout

docs/guides/voice/samples/audio_create_ffmpeg.cs

@@ -0,0 +1,11 @@
+private Process CreateStream(string path)
+{
+    var ffmpeg = new ProcessStartInfo
+    {
+        FileName = "ffmpeg",
+        Arguments = $"-i {path} -ac 2 -f s16le -ar 48000 pipe:1",
+        UseShellExecute = false,
+        RedirectStandardOutput = true,
+    };
+    return Process.Start(ffmpeg);
+}

docs/guides/voice/samples/audio_ffmpeg.cs

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+private async Task SendAsync(IAudioClient client, string path)
+{
+    // Create FFmpeg using the previous example
+    var ffmpeg = CreateStream(path);
+    var output = ffmpeg.StandardOutput.BaseStream;
+    var discord = client.CreatePCMStream(AudioApplication.Mixed, 1920);
+    await output.CopyToAsync(discord);
+    await discord.FlushAsync();
+}

docs/guides/voice/samples/joining_audio.cs

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+[Command("join")]
+public async Task JoinChannel(IVoiceChannel channel = null)
+{
+    // Get the audio channel
+    channel = channel ?? (msg.Author as IGuildUser)?.VoiceChannel;
+    if (channel == null) { await msg.Channel.SendMessageAsync("User must be in a voice channel, or a voice channel must be passed as an argument."); return; }
+
+    // For the next step with transmitting audio, you would want to pass this Audio Client in to a service.
+    var audioClient = await channel.ConnectAsync();
+}