v1.5.0 fixing issue with slow browsers, etc.

### Releases v1.5.0

1. Fix issue with slow browsers or network. Check [Target stops responding after variable time when using Firefox on Windows 10 #3](khoih-prog/AsyncWebServer_RP2040W#3)
2. Add functions and example `Async_AdvancedWebServer_favicon` to support `favicon.ico`

Author: khoih-prog

examples/Async_AdvancedWebServer_favicon/Async_AdvancedWebServer_favicon.ino

@@ -175,7 +175,7 @@ void setup()
 
   delay(200);
 
-  Serial.print("\nStart Async_AdvancedWebServer on "); Serial.print(BOARD_NAME);
+  Serial.print("\nStart Async_AdvancedWebServer_favicon on "); Serial.print(BOARD_NAME);
   Serial.print(" with "); Serial.println(SHIELD_TYPE);
   Serial.println(ASYNC_WEBSERVER_TEENSY41_VERSION);