Move webserver to core package

This is reverting back from cJson to ArduinoJson as that was adding to memory consumption when webserver was used (quite common), reducing the benefits of a lighter library.

esphome/nspanel_esphome_advanced.yaml

@@ -12,7 +12,6 @@ substitutions:
   ## Change only in your      ##
   ## local yaml substitutions ##
   ap_password: ${wifi_password}
-  web_password: ${wifi_password}
   ##############################
 
 button:
@@ -96,14 +95,6 @@ time:
         - component.update: api_timestamp
         - component.update: device_timestamp
 
-##### Web server #####
-web_server:
-  id: web_server_std
-  port: 80
-  auth:
-    username: admin
-    password: ${web_password}
-
 wifi:
   ap:
     ssid: "${name}"