[PC-1603] Docs 2.0 + Content Fixes - Nicla related changes (#1718)

* Table sizes and difficulty missing fixes

* Nicla Vision 2nd button update

* Sense ME difficulty added

Author: mcmchris

content/hardware/06.nicla/boards/nicla-sense-me/tutorials/web-ble-dashboard/content.md

@@ -1,6 +1,7 @@
 ---
 title: 'Displaying on-Board Sensor Values on a WebBLE Dashboard'
 coverImage: hero-banner.svg
+difficulty: beginner
 tags:
   - Bluetooth®
   - WEB-BLE

content/hardware/06.nicla/boards/nicla-vision/product.md

@@ -4,8 +4,8 @@ url_shop: https://store.arduino.cc/products/nicla-vision
 url_guide: /tutorials/nicla-vision/user-manual
 primary_button_url: /tutorials/nicla-vision/user-manual
 primary_button_title: User Manual
-secondary_button_url: /tutorials/nicla-vision/getting-started
-secondary_button_title: Get Started
+secondary_button_url: /hardware/nicla-vision/#tutorials
+secondary_button_title: All Tutorials
 core: arduino:mbed_nicla
 certifications: [CE, UKCA]
 productCode: '120'

content/hardware/06.nicla/boards/nicla-vision/tutorials/user-manual/content.md

@@ -1729,10 +1729,10 @@ The example code shown above creates a Bluetooth® Low Energy service and charac
 
 - The code begins by importing all the necessary modules and defining the Bluetooth® Low Energy service and characteristics for an environment-sensing application.
 
-  |         **Description**        |       **ID**       |
-  |:------------------------------:|:------------------:|
-  | Environmental Sensing Service  |        181A        |
-  | Temperature Characteristic     |        2A6E        |
+|        **Description**        | **ID** |
+|:-----------------------------:|:------:|
+| Environmental Sensing Service |  181A  |
+|  Temperature Characteristic   |  2A6E  |
 
 - Then sets up the Bluetooth® Low Energy service and characteristics; and begins advertising the defined Bluetooth® Low Energy service.
 
@@ -1856,11 +1856,10 @@ The example code shown above creates a Bluetooth® Low Energy service and charac
 
 - The code begins by importing all the necessary libraries and defining the Bluetooth® Low Energy service and characteristics for an environment sensing application.
 
-
-  |         **Description**        |       **ID**       |
-  |:------------------------------:|:------------------:|
-  | Environmental Sensing Service  |        181A        |
-  | Temperature Characteristic     |        2A6E        |
+|         **Description**        |       **ID**       |
+|:------------------------------:|:------------------:|
+| Environmental Sensing Service  |        181A        |
+| Temperature Characteristic     |        2A6E        |
 
 - In the `setup()` function, the code initializes the Nicla Vision board and sets up the Bluetooth® Low Energy service and characteristics; then, it begins advertising the defined Bluetooth® Low Energy service.
 

content/hardware/06.nicla/boards/nicla-voice/tutorials/getting-started-ml/content.md

@@ -1,6 +1,7 @@
 ---
 title: 'Audio Analysis with Machine Learning and the Nicla Voice'
 description: 'Learn to use the Nicla Voice to create your own Machine Learning audio models with this getting started tutorial.'
+difficulty: intermediate
 tags: 
   - Getting started
   - Machine Learning tools