use a variable for icon size

layouts/partials/social-follow.html

 <!-- TODO: Add follow intents where available TODO: Revisit color and hover color -->
+{{ $icon_size := "32px" }}
 {{ with .Site.Params.facebook }}
   <a href="{{ . }}" class="link-transition facebook link dib z-999 pt3 pt0-l mr2" title="Facebook link">
-    {{ partial "svg/facebook.svg" (dict "size" "32px") }}
+    {{ partial "svg/facebook.svg" (dict "size" $icon_size) }}
   </a>
 {{ end }}
 {{ with .Site.Params.twitter }}
   <a href="{{ . }}" class="link-transition twitter link dib z-999 pt3 pt0-l mr2" title="Twitter link">
-    {{ partial "svg/twitter.svg" (dict "size" "32px") }}
+    {{ partial "svg/twitter.svg" (dict "size" $icon_size) }}
   </a>
 {{ end }}
 {{ with .Site.Params.instagram }}
   <a href="{{ . }}" class="link-transition instagram link dib z-999 pt3 pt0-l mr2" title="Instagram link">
-    {{ partial "svg/instagram.svg" (dict "size" "32px") }}
+    {{ partial "svg/instagram.svg" (dict "size" $icon_size) }}
   </a>
 {{ end }}
 {{ with .Site.Params.youtube }}
   <a href="{{ . }}" class="link-transition youtube link dib z-999 pt3 pt0-l mr3" title="Youtube link">
-    {{ partial "svg/youtube.svg" (dict "size" "32px") }}
+    {{ partial "svg/youtube.svg" (dict "size" $icon_size) }}
   </a>
 {{ end }}

readme.md

 - ADD INSTRUCTIONS
 - small dummy copyright notice with a formatted date could be added
 - fix hard-coded link to section https://github.com/budparr/gohugo-default-theme/blob/master/layouts/index.html#L32
+make thumbnails png