Add anchor link to archive layout headers

Author: adityatelange

layouts/_default/archives.html

@@ -36,12 +36,21 @@ <h1>
 {{- range $pages.GroupByPublishDate "2006" }}
 {{- if ne .Key "0001" }}
 <div class="archive-year">
-  <h2 class="archive-year-header">
-    {{- replace .Key "0001" "" }}<sup class="archive-count">&nbsp;&nbsp;{{ len .Pages }}</sup>
+  {{- $year := replace .Key "0001" "" }}
+  <h2 class="archive-year-header" id="{{ $year }}">
+    <a class="archive-header-link" href="#{{ $year }}">
+      {{- $year -}}
+    </a>
+    <sup class="archive-count">&nbsp;{{ len .Pages }}</sup>
   </h2>
   {{- range .Pages.GroupByDate "January" }}
   <div class="archive-month">
-    <h3 class="archive-month-header">{{- .Key }}<sup class="archive-count">&nbsp;&nbsp;{{ len .Pages }}</sup></h3>
+    <h3 class="archive-month-header" id="{{ $year }}-{{ .Key }}">
+      <a class="archive-header-link" href="#{{ $year }}-{{ .Key }}">
+        {{- .Key -}}
+      </a>
+      <sup class="archive-count">&nbsp;{{ len .Pages }}</sup>
+    </h3>
     <div class="archive-posts">
       {{- range .Pages }}
       {{- if eq .Kind "page" }}