Social share visibility

Added the ability to choose which social are available to share.

exampleSite/config.toml

@@ -103,6 +103,14 @@ disqusShortname = "yourdiscussshortname"
     #Skype = "xxxx"
     #Whatsapp = "xxxx"
 
+[params.share]
+Twitter = true
+Facebook = true
+#Reddit = true
+Linkedin = true
+#Pinterest = true
+#HackerNews = true
+#Mix = true
 
 # Used only for Seo schema 
 copyright = "This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License."