docs: rewrite the README around the desktop app and simplify the badg… #146

Job	Run time
Wait for CI and Nix Build	5m 37s
Release	8m 59s
Deploy docs	0s
Publish native release assets	0s
Publish VS Code extension	0s
Update Homebrew tap	0s
Native release artifact	0s
Redeploy CDN	0s
Verify release consistency	0s
	14m 36s

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