Update learn docs (#154)

* Update navigation url

* Update code block

* Strip last_revised field from front matter

Author: lucaronca

learn-docs/00.uno-q/uno-q.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [UNO Q, Overview]
 icon: UNO
 category: basic
-last_revised: 2025/10/01
 ---
 
 ![Arduino UNO Q](assets/uno-q-hero.png)

learn-docs/01.first-setup/first-setup.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [Apps, Bricks, Sketches, Python, SBC]
 icon: Settings
 category: basic
-last_revised: 2025/10/01
 ---
 
 ![Hero Image](assets/first-setup-hero.png)

learn-docs/02.apps/apps.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [Apps, Bricks, Sketches, Python]
 icon: Group
 category: basic
-last_revised: 2025/10/01
 ---
 
 ![Apps.](assets/app-hero.png)
@@ -55,7 +54,7 @@ This function does the following:
 
 The App can also run a **user-defined loop**, using the `user_loop` parameter that receives a function name to be looped:
 
-```arduino
+```python
 def loop():
     global led_state
     time.sleep(1)
@@ -70,7 +69,7 @@ App.run(user_loop=loop)
 
 >**Important Note:** always place the `App.run()` at the very bottom of the `main.py` script, as any code added after will be ignored.
 
-This is used in the [example provided](#understand-the-code-the-blink-example) further down in this tutorial.
+This is used in the [example provided](/learn/apps#understand-the-code-the-blink-example) further down in this tutorial.
 
 ## Create a New App
 

learn-docs/03.bricks/bricks.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [Bricks, AI Models]
 icon: Brick
 category: basic
-last_revised: 2025/10/01
 ---
 
 ![Bricks in the Arduino App Lab](assets/brick-hero.png)

learn-docs/04.ai-models/ai-models.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [AI, ML, Models]
 icon: AI
 category: basic
-last_revised: 2025/10/01
 ---
 
 ![AI Models in the Arduino App Lab](assets/ai-hero.png)

learn-docs/05.examples/examples.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [Examples]
 icon: Group
 category: basic
-last_revised: 2025/10/01
 ---
 
 In the previous guides, we have gone through:

learn-docs/06.single-board-computer/single-board-computer.md

@@ -5,7 +5,6 @@ author: Karl Söderby
 tags: [SBC, Debian, Linux, Terminal]
 icon: Computer
 category: basic
-last_revised: 2025/10/01
 ---
 
 ![UNO Q as a Single Board Computer (SBC)](assets/sbc-hero.png)