feat: rename social media website, including X/Twitter

The commit renames the social sharing feature on
the website. Before the renaming the text was labeled as
'Twitter' and now it has been renamed to 'X/Twitter'.

Motivation:
- To change the presentation of the page.
- To improve the experience of the user.
- To show the correct name of the platform.
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</git_diff>
</commit_message>

app/views/shared/_share_social.html.erb

@@ -17,14 +17,14 @@
 
     <!-- Twitter/X -->
     <button class="btn btn-info"
-            data-sharer="twitter"
+            data-sharer="x"
             data-title="<%= title %>"
             data-hashtags=<%= tags %>
             data-url="<%= request.original_url %>">
       <svg class="w-5 h-5 mr-2" fill="currentColor" viewBox="0 0 24 24">
         <path d="M18.244 2.25h3.308l-7.227 8.26 8.502 11.24H16.17l-5.214-6.817L4.99 21.75H1.68l7.73-8.835L1.254 2.25H8.08l4.713 6.231zm-1.161 17.52h1.833L7.084 4.126H5.117z"/>
       </svg>
-      Twitter
+      X/Twitter
     </button>
 
     <!-- LinkedIn -->