patch: fix issue with canonical urls (#15)

This solve the issue caused by the missing of the canonical urls.

Additionally, it add the fodydev discord server in the website.

Author: pythonbrad

config/_default/params.yaml

@@ -17,7 +17,7 @@ github:
 
 social_links:
   devstats: ""
-  discord: ""
+  discord: "https://discord.gg/W6MzznwU6"
   facebook: ""
   flickr: ""
   github: "https://github.com/fodydev"

layouts/partials/head/custom-head.html

@@ -10,3 +10,4 @@
 {{ if (eq .Kind "home") }}
 <link rel="stylesheet" href="{{ $style.RelPermalink }}" integrity="{{ $style.Data.Integrity }}" media="all">
 {{ end }}
+<link rel="canonical" href="{{ .Permalink }}"/>