Adding improv BLE support to the website.

[barndawgie]

For clients with improv BLE enabled, this enables them to be configured form the Installation page.

[barndawgie]

If you'd like to test this, you can image an ATOM Lite device with no wi-fi creds and add this to your config:

binary_sensor:
  - platform: gpio
    id: atom_button
    pin:
      number: GPIO39
      inverted: true
    name: "ATOM Lite Button"
    icon: "mdi:gesture-tap-button"
    disabled_by_default: true

light:
  - platform: fastled_clockless
    id: atom_led
    chipset: SK6812
    num_leds: 1
    name: "ATOM Lite LED"
    pin: GPIO27
    disabled_by_default: true

output:
  - platform: template
    id: atom_led_output
    type: binary
    write_action:
      if:
        condition:
          lambda: return state;
        then:
          - light.turn_on: atom_led
        else:
          - light.turn_off: atom_led

esp32_improv:
  authorizer: atom_button
  status_indicator: atom_led_output