Add Telegram to social links (#625)

_config.yml

@@ -55,6 +55,7 @@ social-network-links:
 #  steam: deanat78
 #  twitch: yourname
 #  yelp: yourname
+#  telegram: yourname
 
 # --- General options --- #
 

_includes/social-networks-links.html

@@ -24,6 +24,18 @@
   </li>
 {%- endif -%}
 
+{%- if site.social-network-links.telegram -%}
+  <li>
+    <a href="https://t.me/{{ site.social-network-links.telegram }}" title="Telegram">
+      <span class="fa-stack fa-lg" aria-hidden="true">
+        <i class="fas fa-circle fa-stack-2x"></i>
+        <i class="fab fa-telegram-plane fa-stack-1x fa-inverse"></i>
+      </span>
+      <span class="sr-only">Telegram</span>
+    </a>
+  </li>
+{%- endif -%}
+  
 {%- if site.social-network-links.github -%}
   <li>
     <a href="https://github.com/{{ site.social-network-links.github }}" title="GitHub">