Add Nuki Bluetooth Signal Strength to documentation and firmware #637

Job	Run time
Prepare release data	4s
Build Docs / build-docs	38s
Build Stock Firmware (Home Assistant, stable)	0s
Build Nuki Bridge Firmware (Home Assistant, stable)	0s
Build Nuki Bridge Firmware (Home Assistant, dev) / Prepare	3s
Build Stock Firmware (Home Assistant, dev) / Prepare	3s
Build Nuki Bridge Firmware (Home Assistant, dev) / Build firmware/ha-doorman-nuki-bridge.dev.yaml	4m 27s
Build Stock Firmware (Home Assistant, dev) / Build firmware/ha-doorman-stock.dev.yaml	4m 26s
Create asset bundle (stable)	0s
Deploy to Github Pages (stable)	0s
Create asset bundle (dev) / Create asset bundle	11s
Deploy to surge.sh (dev)	26s
	10m 18s

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