feat(landing): add PostHog tracking for CTA clicks, demo requests, an… #13720

Job	Run time
Detect Version	3s
Test and Build / Test and Build	3m 34s
Check Docs Changes	0s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	2m 34s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	5m 2s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	7m 1s
Build ARM64 (GHCR Only)	-1s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	18m 13s

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