fix: Make email address clickable in contact info

Converts plain text email address into a mailto link to
enhance user experience by enabling direct email initiation
from the website contact section.

templates/index.html

@@ -140,7 +140,7 @@
               </div>
               <div class="px-2">
                 <h6 class="fw-bold mb-0">Email</h6>
-                <p class="text-muted mb-0">support@private.coffee</p>
+                <p class="text-muted mb-0"><a href="mailto:support@private.coffee">support@private.coffee</a></p>
               </div>
             </div>
           </div>