[DOCS] Optimize landing page loading (#1890)

docs/README.md

@@ -93,17 +93,20 @@ Support the project by purchasing the [Theengs bridge](https://shop.theengs.io/p
 * [Using low-cost wireless sensors in the unlicensed bands](https://lwn.net/Articles/921497/)
 * [SMART PLUG ESP32 OPENMQTTGATEWAY SERVING AS AN BLE MQTT GATEWAY AND A POWER METER](https://www.electronics-lab.com/smart-plug-esp32-openmqttgateway-serving-as-an-ble-mqtt-gateway-and-a-power-meter/)
 
+### Theengs Plug
+[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/nUwMt9p2U7o/0.jpg)](https://www.youtube.com/watch?v=nUwMt9p2U7o&t=427s)
+
 ### 433Mhz and BLE
-<iframe width="560" height="315" src="https://youtube.com/embed/_gdXR1uklaY" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
+[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/_gdXR1uklaY/0.jpg)](https://www.youtube.com/watch?v=_gdXR1uklaY)
 
 ### BLE
-<iframe width="560" height="315" src="https://www.youtube.com/embed/noUROhtf0E0" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
+[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/noUROhtf0E0/0.jpg)](https://www.youtube.com/watch?v=noUROhtf0E0)
 
 ### 433Mhz
-<iframe width="560" height="315" src="https://youtube.com/embed/H-JXWbWjJYE" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
+[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/H-JXWbWjJYE/0.jpg)](https://www.youtube.com/watch?v=H-JXWbWjJYE)
 
 ### LORA
-<iframe width="560" height="315" src="https://www.youtube.com/embed/6DftaHxDawM" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
+[![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/6DftaHxDawM/0.jpg)](https://www.youtube.com/watch?v=6DftaHxDawM)
 
 ::: warning Note
 The material and information contained in this documentation is for general information purposes only. You should not rely upon the material or information on this documentation as a basis for making any business, legal or any other decisions. There is no warranty given on this documentation content. If you decide to follow the information and materials given it is at your own risk. I will not be liable for any false, inaccurate, inappropriate or incomplete information presented on this website.