first quick pass of user menu in navbar which shows simple read only prefs content, and a logout option that works

templates/base.html

@@ -114,6 +114,15 @@
                         <input class="form-control" type="search" placeholder="by file, date (YYYMMDD) or tag" aria-label="Search" name="search_term">
                         <button class="btn btn-outline-success" type="submit">Search</button>
                     </form>
+                    <div class="nav-item dropdown">
+                      <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+                       <svg width="20" height="20" fill="currentColor"><use xlink:href="{{url_for('internal', filename='icons.svg')}}#user"/></svg>
+                      </a>
+                      <div class="dropdown-menu dropdown-menu-end" aria-labelledby="navbarDropdownMenuLink">
+                        <div><a class="dropdown-item" href="{{url_for('prefs')}}">{{current_user|Username}}</a></div>
+                        <div><a class="dropdown-item" href="{{url_for('logout')}}">Logout</a></div>
+                      </div>
+                    </div>
                 </div class="navbar-nav">
             </div class="collapse navbar-collapse">
         </div class="container-fluid">