#98: replacing readFile with partial for predefined icons

This approach has been taken from another popular hugo-theme `ananke`:
e3f7fbe39d/layouts/partials/social-follow.html (L41)

layouts/partials/font-awesome.html

@@ -1,15 +1,15 @@
 <span class="inline-svg" >
-    
+
 {{ $dict := newScratch }}
 
-{{ if (eq .custom true) }} 
-    {{ $dict.Set "filename" (print "static/fa-icons/" .iconName ".svg") }}
+{{ if (eq .custom true) }}
+    {{ $dict.Set "svg" (readFile (print "static/fa-icons/" .iconName ".svg")) }}
 {{ else }}
-    {{ $dict.Set "filename" (print "themes/anubis/static/fa-icons/" .iconName ".svg") }}
+    {{ $dict.Set "svg" (partial (print "fa-icons/" .iconName ".svg")) }}
 {{ end }}
 
 {{- $path:="<path" -}}
 {{- $fill:="<path fill=\"currentColor\"" -}}
-{{ replace (readFile ($dict.Get "filename")) $path $fill | safeHTML }}
+{{ replace ($dict.Get "svg") $path $fill | safeHTML }}
 
 </span>