update

Author: ThomasFarstrike

docs/apps/developing-apps.md

@@ -70,7 +70,7 @@ In `MANIFEST.JSON`, put:
 
 ## Icon
 
-The icon is a simple 64x64 pixel PNG image, which you can create with any tool, such as GIMP.
+The icon is a [simple 64x64 pixel PNG image](https://github.com/MicroPythonOS/MicroPythonOS/blob/main/internal_filesystem/builtin/apps/com.micropythonos.launcher/res/mipmap-mdpi/icon_64x64.png), which you can create with any tool, such as GIMP.
 
 It's recommended to keep it as small as possible by setting compression level to 9 and not storing any metadata such as background color, resolution, creation time, comments, Exif data, XMP data, thumbnail or color profile.
 

docs/architecture/filesystem.md

@@ -3,12 +3,17 @@
 MicroPythonOS uses a structured filesystem to organize apps, data, and resources.
 
 - **/apps/**: Directory for downloaded and installed apps.
-  - **/apps/com.micropythonos.helloworld/**: Installation directory for HelloWorld App. See [Developing Apps](../apps/developing-apps.md).
+    - **com.micropythonos.helloworld/**: Installation directory for HelloWorld App. See [Developing Apps](../apps/developing-apps.md).
 - **/builtin/**: Read-only filesystem compiled into the OS, mounted at boot by `main.py`.
-  - **/builtin/apps/**: See [Built-in Apps](../apps/built-in-apps.md). 
-  - **/builtin/res/mipmap-mdpi/default_icon_64x64.bin**: Default icon for apps without one.
+    - **apps/**: See [Built-in Apps](../apps/built-in-apps.md). 
+    - **res/mipmap-mdpi/default_icon_64x64.png**: Default icon for apps without one.
+- **lib/**: Libraries and frameworks
+    - **mpos/**: MicroPythonOS libraries and frameworks
+        - **ui/**: MicroPythonOS User Interface libraries and frameworks
 - **/data/**: Storage for app data.
-  - **/data/images/**: Images stored by apps (e.g., camera app).
-  - **/data/com.example.app1/**: App-specific storage (e.g., `config.json`) for com.example.app1.
+    - **com.micropythonos.helloworld/**: App-specific storage (e.g., `config.json`)
+    - **com.micropythonos.settings/**: Storage used by the built-in Settings App
+    - **com.micropythonos.wifi/**: Storage used by the built-in WiFi App
+    - **images/**: Generic storage for images (use by e.g. the Camera App).
 
 This structure ensures a clear separation between system resources, apps, and user data.

docs/architecture/system-components.md

@@ -5,8 +5,18 @@ MicroPythonOS consists of several core components that initialize and manage the
 - **boot.py**: Initializes hardware on ESP32 microcontrollers.
 - **boot_unix.py**: Initializes hardware on Linux desktops (and potentially MacOS).
 - **main.py**:
-  - Sets up the user interface.
-  - Provides helper functions for apps.
-  - Launches the `launcher` app to start the system.
+    - Sets up the user interface.
+    - Provides helper functions for apps.
+    - Launches the `launcher` app to start the system.
 
 These components work together to bootstrap the OS and provide a foundation for apps. See [Filesystem Layout](filesystem.md) for where apps and data are stored.
+
+Additionally, the following concepts are also used throughout the code:
+
+- **Activity**
+- **ActivityNavigator**
+- **Intent**
+- **SharedPreferences**
+- **WidgetAnimator**
+- **WiFiService**
+