Case fix (#307)

* Update README.md

* Spelling fixes

* Update hardware.md

* Adding IoT for beginners episode

* Adding intro video

* Fixing formatting of read more and self study sections.

* Adding instructions for installing the ReSpeaker

* Adding auth to language understanding

* Adding Wio terminal timer setting

* Update config.h

* Fixing links and images

* Increasing version numbers for SD card fix

* Adding SD card requirement

* speech and translations

* Adding more on translations

* All Wio Terminal now working except playing audio

* Adding more details on virtual environments.

* Fixing tracking links

* Update app.py

* Changing casing for case sensitive OSes

1-getting-started/lessons/1-introduction-to-iot/translations/virtual-device.pt.md

@@ -177,7 +177,7 @@ Como uma segunda etapa 'Hello World', você executará o aplicativo CounterFit e
 1. A partir do terminal do VS Code, inicie o aplicativo CounterFit com o seguinte comando:
 
     ```sh
-    CounterFit
+    counterfit
     ```
 
     O aplicativo começará a funcionar e abrir no seu navegador da web:

1-getting-started/lessons/1-introduction-to-iot/translations/virtual-device.zh-cn.md

@@ -177,7 +177,7 @@ Python 的强大功能之一是能够安装 [pip 软件包](https://pypi.org)；
 1. 从 VS Code 终端，用以下的命令启动 CounterFit 应用：
 
     ```sh
-    CounterFit
+    counterfit
     ```
 
     应用将开始运行以及在你的网页浏览器打开：

1-getting-started/lessons/1-introduction-to-iot/virtual-device.md

@@ -188,7 +188,7 @@ As a second 'Hello World' step, you will run the CounterFit app and connect your
 1. From the VS Code terminal, launch the CounterFit app with the following command:
 
     ```sh
-    CounterFit
+    counterfit
     ```
 
     The app will start running and open in your web browser: