New translations introduction.mdx (Russian)

Author: benface

website/src/pages/ru/substreams/introduction.mdx

@@ -1,6 +1,6 @@
 ---
 title: Introduction to Substreams
-sidebarTitle: Introduction
+sidebarTitle: Введение
 ---
 
 ![Substreams Logo](/img/substreams-logo.png)