Add 'target=_blank' to social share links

A 'TODO' comment was added for completion in the future. The social share links have been updated to open in a new tab in order to improve user experience. This prevents the current page from being closed when a social share link is clicked. #55

src/themes/sundown-sessions/layouts/partials/social-share.html

@@ -1,3 +1,4 @@
+<!-- TODO: CG to complete... -->
 {{ $title := .Title }}
 {{ $url := printf "%s" .Permalink | absLangURL }}
 
@@ -14,7 +15,7 @@
   <div id="sharing" class="mt3 ananke-socials">
     {{ range $service :=  $services }}
       {{ $href := index $hrefs .name }}
-      <a href="{{ $href }}" class="ananke-social-link {{ .name }} no-underline" aria-label="share on {{ .label }}">
+      <a href="{{ $href }}" target="_blank" rel="noopener noreferrer" class="ananke-social-link {{ .name }} no-underline" aria-label="share on {{ .label }}">
         {{ with .icon }}
         <span class="icon"> {{ . }}</span>
         {{ end }}