Add optional custom "title" for social links (adityatelange#999)

Co-authored-by: Aditya Telange <[email protected]>

Author: Netruk44

layouts/partials/social_icons.html

@@ -1,6 +1,6 @@
 <div class="social-icons">
     {{- range . }}
-    <a href="{{ trim .url " " }}" target="_blank" rel="noopener noreferrer me" title="{{ .name | title }}">
+    <a href="{{ trim .url " " }}" target="_blank" rel="noopener noreferrer me" title="{{ (.title | default .name) | title }}">
         {{ partial "svg.html" . }}
     </a>
     {{- end }}