Add more social icons to footer (#70)

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

layouts/_default/list.html

@@ -6,7 +6,7 @@
     <main class="card-container side-gutter">
       {{ if or (not (eq .Description "")) (not (eq .Title "")) -}}
       <header class="list-header">
-        {{ with .Title }}<h1 class="list-header-title">{{ . }}</h1>{{ end }}
+        {{ with .Title | markdownify }}<h1 class="list-header-title">{{ . }}</h1>{{ end }}
         {{ with .Description }}<p class="list-header-subtext">{{ . }}</p>{{ end }}
       </header>
       {{- end }}