Clean up directory structure of partials and .Render templates

layouts/partials/post-meta-item/viewsource.html

@@ -0,0 +1,13 @@
+{{ if and .Site.Params.gitFileURL .File.Path }}
+<span class="post-meta-item">
+    {{ with .Site.Params.gitFileIcon }}
+    {{ partial "icon.html" . }}
+    {{ else }}
+    {{ partial "icon.html" "file" }}
+    {{ end }}
+
+    <a href="{{ printf "%s/content/%s" .Site.Params.gitFileURL .File.Path }}" target="_blank" rel="noopener">
+        View source
+    </a>
+</span>
+{{ end }}