Remove link to Twitter, add link to official Telegram group

components/indexhtml/index-en.html.in

@@ -80,7 +80,7 @@
 <tr><td colspan="3" id="social-pane">
 <div id="social">We will be glad to meet you on the following social networks:</div>
 <div id="social-icons">
-<a href="https://twitter.com/#!/altlinuxru" class="image"><img src="images/twitter.png" alt="Twitter" class="banner"></a>
+<a href="https://t.me/alt_linux" class="image"><img src="images/telegram.png" alt="Telegram" class="banner"></a>
 <a href="https://www.facebook.com/group.php?gid=136328550579" class="image"><img src="images/facebook.png" alt="Facebook" class="banner"></a>
 <a href="https://vk.com/altlinux" class="image"><img src="images/vkontakte.png" alt="VKontakte" class="banner"></a>
 </div></td></tr>

components/indexhtml/index-ru.html.in

@@ -80,7 +80,7 @@
 <tr><td colspan="3" id="social-pane">
 <div id="social">Мы рады встретиться с вами в социальных сетях:</div>
 <div id="social-icons">
-<a href="https://twitter.com/#!/altlinuxru" class="image"><img src="images/twitter.png" alt="Twitter" class="banner"></a>
+<a href="https://t.me/alt_linux" class="image"><img src="images/telegram.png" alt="Telegram" class="banner"></a>
 <a href="https://www.facebook.com/group.php?gid=136328550579" class="image"><img src="images/facebook.png" alt="Facebook" class="banner"></a>
 <a href="https://vk.com/altlinux" class="image"><img src="images/vkontakte.png" alt="ВКонтакте" class="banner"></a>
 </div></td></tr>