docs: relocate PRIVACY.md to docs/ and refresh content #455

Job	Run time
Rust lint and unit tests	1m 18s
Client lint, build, and tests	33s
Build integration artifacts	1m 34s
Packages and VS Code extension	30s
Android emulator integration	57s
CLI simulator integration	1s
JS API simulator integration	1s
WebRTC stream benchmark	1s
	4m 55s

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