Content fixes (arduino#8)

* Remove background from cover image

* Fix incorrect note syntax

* Update incorrect info in readme

* Add missing reference to previous tutorial

* Add access point tutorial to overview

Author: sebromero

README.md

@@ -22,7 +22,7 @@ For headings you need to use the hash symbol `#`. # stands for H1, ## for H2 an
 
 We use only two different types of emphasis. When emphasizing singe words we use a double asterisk syntax: `**I am bold**`. This will be rendered as bold text. Italic is not supported.
 
-For important notes we use a tripple asterisk syntax to highlight the complete paragraph `*** Note: This is important! ***`. You can still emphasize single words inside such a block `*** **Note:** This is important! ***`.
+For important notes we use a tripple asterisk syntax to highlight the complete paragraph `***Note: This is important!***`. You can still emphasize single words inside such a block by using the underscore syntax `***__Note:__ This is important! ***`.
 
 We use single word emphasis for filenames and for referring to UI elements (e.g. a button label in the Arduino IDE).
 

content/tutorials/portenta-h7/metadata.json

@@ -5,5 +5,5 @@
    "content": null,
    "pageName": "Portenta H7 Tutorials",
    "slug": "portenta-h7",
-   "tutorials": ["por-ard-gs", "por-ard-dcp"]
+   "tutorials": ["por-ard-gs", "por-ard-dcp", "por-ard-ap"]
  }

content/tutorials/portenta-h7/por-ard-ap/assets/por_ard_ap_cover.svg

@@ -41,7 +41,7 @@ Here the web page is just a simple HTML page with buttons to toggle the LED stat
 
 ![The sequence of actions in the tutorial’s client-server model](assets/por_ard_ap_sketch_explanation.svg?sanitize=true)
 
-*** **Note:** Remember that the built-in RGB LEDs  on the Portenta H7 need to be pulled to ground to make them light up. This means that a voltage level of LOW on each of their pins will turn the specific color of the LED on, a voltage level of HIGH will turn them off.***
+***Remember that the built-in RGB LEDs  on the Portenta H7 need to be pulled to ground to make them light up. This means that a voltage level of __LOW__ on each of their pins will turn the specific color of the LED on, a voltage level of __HIGH__ will turn them off.***
 
 ## 3. Create the arduino_secrets.h tab  
 

content/tutorials/portenta-h7/por-ard-ap/content.md

@@ -16,6 +16,6 @@
       "Web Server"
    ],
    "abstract":"In this tutorial you will configure the Portenta H7 as an access point and build a simple web server that will allow you to control the built-in RGB LEDs from your mobile device.",
-   "previousArticle":"null",
+   "previousArticle":"por-ard-dcp",
    "nextArticle":null
 }