Add release notes page keyed to major bring-up commits

docs/architecture.html

@@ -15,6 +15,7 @@
         <a href="implementation-log.html">Implementation Log</a>
         <a href="bring-up.html">Bring-Up</a>
         <a href="reports.html">Reports</a>
+        <a href="release-notes.html">Release Notes</a>
       </nav>
     </div>
   </header>