Add energy tracker (/projects/energy)

Public, read-only page over the ned-collector energy schema: latest-hour
mix and per-source utilization, generation vs consumption with CO2
intensity (day/week/month/12 months/all years), NED forecast, gas storage
by year and per site, and gas-fired power share vs storage fill.
Incomplete hours (sources not summing to the NED total) are left out and
partial days/months/years are marked.

src/lib/projects.ts

@@ -58,6 +58,12 @@ export const trackers = [
 		href: '/projects/cs-prices',
 		external: false
 	},
+	{
+		name: 'energy',
+		subtitle: 'Dutch electricity mix, utilization and gas storage',
+		href: '/projects/energy',
+		external: false
+	},
 	{
 		name: 'animaldex',
 		subtitle: 'add neighborhood pets to the world map',