docs(desktop): add Sim Desktop page and README download link #30379

Job	Run time
Test and Build / Test (shard 3)	1m 37s
Test and Build / Test (shard 2)	1m 32s
Test and Build / Build App	2m 26s
Test and Build / Lint and Test	2m 9s
Check Docs Changes	0s
Build Dev ECR	0s
Check Desktop Signing Secrets	0s
Build AMD64	0s
Deploy Trigger.dev (Dev)	0s
Create Desktop Prerelease	-1s
Desktop Prerelease Build	-1s
Publish Desktop Prerelease	-1s
Prune Desktop Prereleases	0s
Detect Version	-7s
Build ARM64 (GHCR Only)	-8s
Detect Desktop Changes	-8s
Migrate Dev DB	-9s
Promote Images	-1s
Migrate DB	-1s
Process Docs	0s
Resolve Attestation Subjects	0s
Create GHCR Manifests	0s
Attest Images	0s
Create GitHub Release	0s
Desktop Release	-1s
	7m 6s

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