Add mastodon

_config.yml

@@ -26,8 +26,8 @@ footer-links:
   instagram:
   linkedin:
   pinterest:
-  rss: # just type anything here for a working RSS icon
-  twitter: FEX_Emu
+  rss: feed # just type anything here for a working RSS icon
+  mastodon: FEX_Emu
   stackoverflow: # your stackoverflow profile, e.g. "users/50476/bart-kiers"
   youtube: # channel/<your_long_string> or user/<user-name>
   googleplus: # anything in your profile username that comes after plus.google.com/

_includes/svg-icons.html

@@ -8,7 +8,7 @@
 {% if site.footer-links.linkedin %}<a href="https://www.linkedin.com/in/{{ site.footer-links.linkedin }}"><i class="svg-icon linkedin"></i></a>{% endif %}
 {% if site.footer-links.pinterest %}<a href="https://www.pinterest.com/{{ site.footer-links.pinterest }}"><i class="svg-icon pinterest"></i></a>{% endif %}
 {% if site.footer-links.rss %}<a href="{{ site.baseurl }}/feed.xml"><i class="svg-icon rss"></i></a>{% endif %}
-{% if site.footer-links.twitter %}<a href="https://www.twitter.com/{{ site.footer-links.twitter }}"><i class="svg-icon twitter"></i></a>{% endif %}
+{% if site.footer-links.mastodon %}<a href="https://www.mastodon.social/@{{ site.footer-links.mastodon }}"><i class="svg-icon mastodon"></i></a>{% endif %}
 {% if site.footer-links.stackoverflow %}<a href="http://stackoverflow.com/{{ site.footer-links.stackoverflow }}"><i class="svg-icon stackoverflow"></i></a>{% endif %}
 {% if site.footer-links.youtube %}<a href="https://youtube.com/{{ site.footer-links.youtube }}"><i class="svg-icon youtube"></i></a>{% endif %}
 {% if site.footer-links.googleplus %}<a href="https://plus.google.com/{{ site.footer-links.googleplus }}"><i class="svg-icon googleplus"></i></a>{% endif %}