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

themes/docdock/layouts/partials/next-prev-page.html

@@ -0,0 +1,44 @@
+<div id="navigation">
+<!-- Next prev page -->
+{{- $currentNode := . -}}
+
+{{- template "menu-nextprev" dict "menu" .Site.Home "currentnode" $currentNode -}}
+
+{{- define "menu-nextprev" -}}
+    {{- $currentNode := .currentnode -}}
+    {{- if ne .menu.Params.hidden true -}}
+        {{- if hasPrefix $currentNode.Permalink .menu.Permalink -}}
+            {{- $currentNode.Scratch.Set "NextPageOK" "OK" -}}
+            {{- $currentNode.Scratch.Set "prevPage" ($currentNode.Scratch.Get "prevPageTmp") -}}
+        {{- else -}}
+            {{- if eq ($currentNode.Scratch.Get "NextPageOK") "OK" -}}
+                {{- $currentNode.Scratch.Set "NextPageOK" nil -}}
+                {{- $currentNode.Scratch.Set "nextPage" .menu -}}
+            {{- end -}}
+        {{- end -}}
+        {{- $currentNode.Scratch.Set "prevPageTmp" .menu -}}
+
+            {{- $currentNode.Scratch.Set "pages" .menu.Pages -}}
+            {{- if .menu.IsHome -}}
+                {{- $currentNode.Scratch.Set "pages" .menu.Sections -}}
+            {{- else if .menu.Sections -}}
+                {{- $currentNode.Scratch.Set "pages" (.menu.Pages | union .menu.Sections) -}}
+            {{- end -}}
+            {{- $pages := ($currentNode.Scratch.Get "pages") -}}
+
+            {{- range $pages.ByWeight -}}
+                {{- template "menu-nextprev" dict "menu" . "currentnode" $currentNode -}}
+            {{- end -}}
+    {{- end -}}
+{{- end -}}
+
+    
+{{- if not $.Site.Params.disableNavChevron -}}
+    {{- with ($.Scratch.Get "prevPage") -}}
+        <a class="nav nav-prev" href="{{.RelPermalink}}" title="{{.Title}}"> <i class="fa fa-chevron-left"></i><label>{{.Title}}</label></a>
+    {{ end -}}
+    {{- with ($.Scratch.Get "nextPage") -}}
+        <a class="nav nav-next" href="{{.RelPermalink}}" title="{{.Title}}" style="margin-right: 0px;"><label>{{.Title}}</label><i class="fa fa-chevron-right"></i></a>
+    {{- end }}
+{{- end -}}
+</div>