v1.4.1 for ESP8266 using W5x00/ENC28J60 Ethernet

#### Releases v1.4.1

1. Initial coding to port [ESPAsyncWebServer](https://github.com/me-no-dev/ESPAsyncWebServer) to ESP8266 boards using W5x00 / ENC28J60 Ethernet.
2. Add more examples.
3. Add debugging features.
4. Bump up to v1.4.1 to sync with [AsyncWebServer_WT32_ETH01 v1.4.1](https://github.com/khoih-prog/AsyncWebServer_WT32_ETH01).

Author: khoih-prog

README.md

@@ -1603,7 +1603,7 @@ alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
 The following are debug terminal output and screen shot when running example [Async_AdvancedWebServer](examples/Async_AdvancedWebServer) on **ESP8266_NODEMCU_ESP12E** with `ESP8266_ENC28J60` Ethernet
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/EthernetWebServer/blob/master/pics/Async_AdvancedWebServer_ENC28J60.png">
+    <img src="https://github.com/khoih-prog/AsyncWebServer_Ethernet/blob/main/pics/Async_AdvancedWebServer_ENC28J60.png">
 </p>
 
 ```
@@ -1621,7 +1621,7 @@ HTTP EthernetWebServer is @ IP : 192.168.2.187
 The following are debug terminal output and screen shot when running example [Async_AdvancedWebServer](examples/Async_AdvancedWebServer) on **ESP8266_NODEMCU_ESP12E** with `ESP8266_W5500` Ethernet
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/EthernetWebServer/blob/master/pics/Async_AdvancedWebServer_W5500.png">
+    <img src="https://github.com/khoih-prog/AsyncWebServer_Ethernet/blob/main/pics/Async_AdvancedWebServer_W5500.png">
 </p>
 
 ```

library.properties

@@ -7,6 +7,6 @@ paragraph=This is Asynchronous HTTP and WebSocket Server Library for ESP8266 usi
 category=Communication
 url=https://github.com/khoih-prog/AsyncWebServer_Ethernet
 license=GPLv3
-architectures=*
+architectures=esp8266
 depends=ESPAsyncTCP
 includes=AsyncWebServer_Ethernet.h