pages/layouts/partials/category-button.html

{{ with .Param "categories" }}
  {{ range $i, $category := . }}
    {{ if eq $i 0 }}
      {{ with $.Site.GetPage (printf "/%s/%s" "categories" $category) }}
        {{ $iconDictionary := dict
          "video" "video"
          "paper" "book"
          "poster" "presentation"
          "thesis" "graduation-cap"
          "presentation" "podium"
          "web" "globe"
          "blog" "block-quote"
        }}
        {{ $categoryIcon := index $iconDictionary $category }}
        <a
          class="category-button"
          href="{{ .RelPermalink }}"
          title="{{ humanize $category }}"
        >
          {{- partial "fa.html" $categoryIcon -}}
        </a>
      {{ end }}
    {{ end }}
  {{ end }}
{{ end }}