Added support for local avatar

Now user can choose to use local avatar or gravatar

exampleSite/config.toml

@@ -51,7 +51,8 @@ disqusShortname = "yourdiscussshortname"
     yandex_verification = ""
     pinterest_verification = ""
     baidu_verification = ""
-
+    
+    avatar = "/images/me/avatar.jpg" #comment it to use gravatar
     socialShare = true
     
     description = "" # site description
@@ -60,7 +61,8 @@ disqusShortname = "yourdiscussshortname"
     license= 'Released under <a rel="license external nofollow noopener noreffer" href="https://creativecommons.org/licenses/by-nc/4.0/" target="_blank">CC BY-NC 4.0</a>'
 
 [params.gravatar]
-    email = ""
+    #email = "example@gmail.com"   #uncomment and insert your email address to use gravatar
+
 
 [params.social]
     GitHub = "xxxx"