nspanel: popups for OTA progress and device info, Info card on every panel

common/nspanel_popup.yaml shows a popupNotify page during OTA (written straight
to the display uart, since OTA blocks the loop that sends the component's
queued commands) and a device info popup (version, build time, IPs) from the
Info button on the new last card or the show_info API action. The OTA gets
id ota_esphome to extend it. Also documents the NSPanel pinout.

common/ota_esp32.yaml

@@ -1,5 +1,6 @@
 ---
 ota:
   - platform: esphome
+    id: ota_esphome
     password: !secret ota_password
     allow_partition_access: true