Add back tag cloud removed by accident (#364)

Author: stefanv

layouts/partials/posts/list.html

@@ -1,4 +1,33 @@
 <section class="section content-padding flex-row">
+  <div class="tag-cloud is-hidden-mobile">
+    <h2 class="tag-cloud-title">{{ i18n "tags" }}</h2>
+    {{ if not (eq (len $.Site.Taxonomies.tags) 0) }}
+      {{ $fontUnit := "rem" }}
+      {{ $largestFontSize := 2.5 }}
+      {{ $smallestFontSize := 1.0 }}
+      {{ $fontSpread := sub $largestFontSize $smallestFontSize }}
+      {{ $max := add (len (index $.Site.Taxonomies.tags.ByCount 0).Pages) 1 }}
+      {{ $min := len (index $.Site.Taxonomies.tags.ByCount.Reverse 0).Pages }}
+      {{ $spread := sub $max $min }}
+      {{ $fontStep := div $fontSpread $spread }}
+      <ul class="tag-cloud-item">
+        {{ range $name, $taxonomy := $.Site.Taxonomies.tags }}
+          {{ $currentTagCount := len $taxonomy.Pages }}
+          {{ $currentFontSize := (add $smallestFontSize (mul (sub $currentTagCount $min) $fontStep) ) }}
+          {{ $count := len $taxonomy.Pages }}
+          {{ $weight := div (sub (math.Log $count) (math.Log $min)) (sub (math.Log $max) (math.Log $min)) }}
+          {{ $currentFontSize := (add $smallestFontSize (mul (sub $largestFontSize $smallestFontSize) $weight) ) }}
+          <li>
+            <a href="{{ "/tags/" | relLangURL }}{{ $name | urlize }}"
+               style="font-size:{{$currentFontSize}}{{$fontUnit}}"
+            >
+              {{ $name }}
+            </a>
+          </li>
+          {{ end }}
+      </ul>
+      {{ end }}
+  </div>
   <div class="content-container">
     {{ partial "breadcrumbs.html" . }}
     <h1>{{ .Title }}</h1>