Add more social icons to footer (#70)

* Enable markdown in post titles
* Update footer icons to no atrib assets

layouts/_default/li-next.html

@@ -13,7 +13,7 @@
   </div>
   {{ end }}
   <article class="card-body">
-    <h2 class="card-title">{{ .Title }}</h2>
+    <h2 class="card-title">{{ .Title | markdownify }}</h2>
     <p class="card-text">{{ if (isset .Params "description") }}{{ index .Params "description" | htmlUnescape }}{{ else }}{{ .Summary | plainify | htmlUnescape }}{{ end }}</p>
     <div class="card-subtext muted-text">
       <p>Posted <time datetime="{{ .PublishDate.Format "2006-01-02 12:00" }}">{{ .PublishDate.Format "Jan 2, 2006" }}</time></p>