Move Ruuvi to BLE proxy

Something happened and they went down. During reflash the firmware was
upgraded to v3 which made them discoverable via BLE.

Repurposed Ruuvi to a generic BLE proxy then.

reflash.sh

@@ -48,7 +48,8 @@ for config in \
 done
 
 for btproxy_replica in \
-	c25bac
+	c25bac \
+	c25b74
 do
 	flash+=("${command?} btproxy.yaml --device btproxy-${btproxy_replica?}")
 done

ruuvi.yaml

@@ -1,45 +0,0 @@
-esphome:
-  name: ruuvi
-  friendly_name: "Ruuvi"
-  area: "Attic"
-
-  project:
-    name: dasfoo.ruuvi
-    version: "1.0"
-
-esp32:
-  # Required for BLE.
-  framework:
-    type: esp-idf
-
-packages:
-  device_base: !include templates/esp32-poe.yaml
-
-# Required for ruuvitag.
-esp32_ble_tracker:
-
-sensor:
-- platform: ruuvitag
-  mac_address: CE:43:F8:76:DF:2E
-  humidity:
-    name: "Garage Humidity"
-  temperature:
-    name: "Garage Temperature"
-  pressure:
-    name: "Garage Pressure"
-  acceleration:
-    name: "Garage Acceleration"
-  battery_voltage:
-    name: "Garage Sensor Battery Voltage"
-- platform: ruuvitag
-  mac_address: C9:3A:C7:42:BD:47
-  humidity:
-    name: "Outdoor West Humidity"
-  temperature:
-    name: "Outdoor West Temperature"
-  pressure:
-    name: "Outdoor West Pressure"
-  acceleration:
-    name: "Outdoor West Acceleration"
-  battery_voltage:
-    name: "Outdoor West Sensor Battery Voltage"