feat(signage): show messages on team dashboard

shiftregister/signage/templates/team_dashboard.html

@@ -3,6 +3,7 @@
 {% block everything %}
 <section class="section">
     <div class="container">
+{% include "notifications.html" %}
         <h3 class="title" style="background:var(--background);margin:0 -1rem;padding:1rem;position:sticky;top:0;">Teamschichten für {{ today|date:"l, d. F Y" }}</h3>
         <table class="table">
             <thead style="background:inherit;position:sticky;top:4rem;">