v1.3.0 to enable scan of WiFi networks

### Major Release v1.3.0

1. Enable scan of WiFi networks for selection in Configuration Portal. Check [PR for v1.3.0 - Enable scan of WiFi networks #10](khoih-prog/WiFiManager_NINA_Lite#10). Now you can select optional **SCAN_WIFI_NETWORKS**, **MANUAL_SSID_INPUT_ALLOWED** to be able to manually input SSID, not only from a scanned SSID lists and **MAX_SSID_IN_LIST** (from 2-6 for ESP8266-AT or 2-15 for other)
2. Minor enhancement to not display garbage when data is invalid
3. Tested with new [Arduino Core for STM32 v2.0.0](https://github.com/stm32duino/Arduino_Core_STM32) and add support to new STM32L5 boards.

README.md

@@ -728,14 +728,14 @@ Enter your credentials,
 ### 1. Without SCAN_WIFI_NETWORKS
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/master/pics/Input.png">
+    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/main/pics/Input.png">
 </p>
 
 ### 2. With SCAN_WIFI_NETWORKS
 
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/master/pics/Input_With_Scan.png">
+    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/main/pics/Input_With_Scan.png">
 </p>
 
 
@@ -744,7 +744,7 @@ Enter your credentials,
 The number of SSIDs in scanned list is limited at max 6.
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/master/pics/ESP_AT_Input_With_Scan.png">
+    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/main/pics/ESP_AT_Input_With_Scan.png">
 </p>
 
 
@@ -1868,7 +1868,7 @@ This is the terminal output when running [**SAMD_WiFi**](examples/SAMD_WiFi) exa
 #### 2.1 Open Config Portal
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/master/pics/ESP_AT_Input_With_Scan.png">
+    <img src="https://github.com/khoih-prog/WiFiManager_Generic_Lite/blob/main/pics/ESP_AT_Input_With_Scan.png">
 </p>