Add Heatmaps to UI

Add Heatmap analysis to website as well as a basic UI for viewing the Heatmaps.
There are still issues, like some players not getting a heatmap assigned and heatmaps including data
from warmup etc.

migrations/2024-09-28-132839_heatmap/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE demo_heatmaps;