Convert docdock theme from submodule to native files and fix Hugo compatibility

themes/docdock/layouts/shortcodes/attachments.html

@@ -0,0 +1,33 @@
+<section class="attachments">
+	<label>
+		<span class="glyphicon glyphicon-paperclip" aria-hidden="true"></span>
+		{{with .Get "title"}}{{.}}{{else}}{{T "Attachments-label"}}{{end}}
+	</label>
+	{{if eq .Page.File.BaseFileName "index"}}
+		{{$.Scratch.Add "filesName" "files"}}
+	{{else}}
+		{{$.Scratch.Add "filesName" (printf "%s.files" .Page.File.BaseFileName)}}
+	{{end}}
+	{{ range (readDir (printf "./content/%s%s" .Page.File.Dir ($.Scratch.Get "filesName")) ) }}
+		{{ $fileDir := replace $.Page.File.Dir "\\" "/" }}
+		{{if ($.Get "pattern")}}
+			{{if (findRE ($.Get "pattern") .Name)}}
+<li>
+    <a href="{{ printf "%s/%s%s/%s" $.Site.BaseURL $fileDir ($.Scratch.Get "filesName") .Name }}" >
+        {{.Name}}
+    </a>
+    ({{div .Size 1024 }} kB)
+</li>
+			{{end}}
+		{{else}}
+<li>
+    <a href="{{ printf "%s/%s%s/%s" $.Site.BaseURL $fileDir ($.Scratch.Get "filesName") .Name }}" >
+        {{.Name}}
+    </a>
+    ({{div .Size 1024 }} kB)
+</li>
+		{{end}}
+	{{end}}
+</section>
+
+{{.Inner}}