Add first draft of newsletter (#2388)

* Add first draft of newsletter

* Update newsletter-2023-06-15.md

* Updating location to post

* Update 2023-06-16-InauguralNewsletter.md

* Update 2023-06-16-InauguralNewsletter.md

Author: matentzn

_includes/header.html

@@ -145,6 +145,16 @@
                     </ul>
                 </li>
 
+                <li class="nav-item dropdown">
+                    <a class="nav-link dropdown-toggle" href="#" id="navbarNewsletterDropdown" role="button"
+                       data-bs-toggle="dropdown" aria-expanded="false">
+                        Citation
+                    </a>
+                    <ul class="dropdown-menu" aria-labelledby="navbarNewsletterDropdown">
+                        <li><a class="dropdown-item" href="/posts/2023-06-16-InauguralNewsletter.html">Inaugural Newsletter 15th June 2023</a></li>
+                    </ul>
+                </li>
+
                 <li class="nav-item">
                     <a class="nav-link" href="/faq/index.html">FAQ</a>
                 </li>