Adding RSS to example page and to social partial, uses the blog's RSS (#18)

* Adding RSS to example page and to social partial, uses the blog's RSS

* Change "if" to "with"

Co-authored-by: Nurlan Suyundukov <dev@nurlan.co>

exampleSite/config.toml

@@ -27,6 +27,7 @@ theme = "hugo-sustain"
   Stackoverflow = "username"
   Medium        = "username"
   Telegram      = "username"
+  RSS           = "/blog/index.xml"
 
 ## Main Menu
 [[menu.main]]

layouts/partials/social.html

@@ -27,5 +27,9 @@
     {{ with .Site.Params.Social.Telegram }}
       <li><a href="https://telegram.me/{{ . }}"><i class="fa fa-telegram"></i></a></li>
     {{ end }}
+
+    {{ with .Site.Params.Social.RSS }}
+      <li><a href="{{ . }}"><i class="fa fa-rss"></i></a></li>
+    {{ end }}
   </ul>
 </div>