Add AdGuard Home DNS config and systemd service units #272

Job	Run time
Check for open PR	2s
Detect Changes	4s
Lint Frontend	0s
Lint Kotlin (${{ matrix.module }})	0s
Build Verification	0s
Frontend Unit Tests	0s
Kotlin Unit Tests (${{ matrix.module }})	0s
Typecheck Frontend	0s
	6s

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