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

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+-- This file should undo anything in `up.sql`
+DROP TABLE demo_heatmaps;

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

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+-- Your SQL goes here
+CREATE TABLE IF NOT EXISTS demo_heatmaps (
+  demo_id bigint REFERENCES demo_info(demo_id),
+  steam_id TEXT NOT NULL,
+  data TEXT NOT NULL,
+  PRIMARY KEY (demo_id, steam_id)
+);