Reimplement rigboard page in a fully responsive manner (#567)

* Revive this concept for 2023

(cherry picked from commit b3939d8426)

# Conflicts:
#	pipeline/source_assets/scss/dark_screen.scss

* Update app.json

* Updates to all three layouts

RIGS/templates/partials/event_table.html

@@ -92,7 +92,7 @@ dd {
     <div class="eventgrid {% if event.cancelled %}
     table-secondary
     {% elif not event.is_rig %}
-    table-info
+    bg-info
     {% elif not event.mic %}
     table-danger
     {% elif event.confirmed and event.authorised %}