[doc] redirect root page to first child

Luca Marchesini · Luca Marchesini · commit 6829a7082b8d · 2020-09-21T10:45:42.000+02:00
diff --git a/doc/2/index.md b/doc/2/index.md
@@ -5,3 +5,4 @@ order: 9
 title: C# SDK
 description: C# SDK 2.x
 ---
+<RedirectToFirstChild />
