feat: add to any

layouts/post/single.html

     </div>
     <footer>
       <hr>
+      <a style="margin-right:2px;" class="u-url no-underline" 
+      href="https://www.addtoany.com/share#url={{ .Permalink }}{{ with .Title }}&title={{ . }}{{ end }}">
+        <svg style="margin-bottom: -3px" class="i-external" viewBox="0 0 32 32" width="16" height="16" fill="none" stroke="currentcolor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2">
+          <path d="M14 9 L3 9 3 29 23 29 23 18 M18 4 L28 4 28 14 M28 4 L14 18"></path>
+        </svg>
+        Share
+      </a>
       {{ partial "post/byline.html" . }}
       {{ partial "post/related-content.html" . }}
       {{ partial "post/comment.html" . }}