add mastodon

Author: gitstua

_config.yml

@@ -81,6 +81,7 @@ social-network-links:
   linkedin: seggerton
 #  xing: yourname
   stackoverflow: "3045411/stuarteggertonagilecoder"
+  mastodon: "https://mastodon.online/@cloudy_stuey"
 #  snapchat: deanat78
 #  instagram: deanat78
 #  youtube: user/deanat78