Replace links to ephemeral file URLs with persistent "resource" links

In addition to the Markdown content source files, this repository hosts non-text files. These are linked to in various
places in the content.

The website publishing system hosts these non-text files in paths under the `static` subfolder of the website. The path
of the published file includes the file's MD5 hash. This means that the URL will change every time the file is modified.
For this reason, hardcoding links to these URLs in the content should be avoided whenever possible.

The repository contains a special `static` folder. The files under that folder are published under the root of the
website, using the same paths as are present in the `static` folder at the time of publishing. In addition to the files
that are hosted in the repository's `static` folder, the repository infrastructure also finds all files under the
`content/hardware` folder with suffix matching standardized patterns used by the common product "resource" files and
copies them to the appropriate locations under the `static` folder before publishing the website. Links should always
target the files at this location when available instead of using the ephemeral URLS.

Author: per1234

content/hardware/04.pro/boards/portenta-c33/tutorials/user-manual/content.md

@@ -84,7 +84,7 @@ The complete datasheet is available and downloadable as PDF from the link below:
 
 The complete schematics are available and downloadable as PDF from the link below:
 
-- [Portenta C33 schematics](https://docs.arduino.cc/static/d7e16a6657c086a034a14a6619cffe7b/ABX00074-schematics.pdf)
+- [Portenta C33 schematics](/resources/schematics/ABX00074-schematics.pdf)
 
 ### STEP Files
 

content/hardware/04.pro/boards/portenta-x8/tutorials/01.user-manual/content.md

@@ -76,7 +76,7 @@ Moreover, Portenta X8 can be further customized to get a continuously maintained
 ### Pinout
 
 The full pinout is available and downloadable as PDF from the link below:
-* [Portenta X8 Pinout](https://docs.arduino.cc/static/019dd9ac3b08f48192dcb1291d37aab9/ABX00049-full-pinout.pdf)
+* [Portenta X8 Pinout](/resources/pinouts/ABX00049-full-pinout.pdf)
 
 ### Datasheet
 
@@ -1187,9 +1187,9 @@ With this tool, you can easily upload containers to a board that is linked to yo
 
 In order to learn how to properly call GPIOs or other peripherals both in the Arduino environment or in Linux, with or without a carrier, you can check the following pinout diagrams:
 
-* [Portenta X8 pinout](https://docs.arduino.cc/static/019dd9ac3b08f48192dcb1291d37aab9/ABX00049-full-pinout.pdf)
-* [Portenta Breakout pinout](https://docs.arduino.cc/static/8d54d1a01d6174ed60fc9698e881ad4c/ASX00031-full-pinout.pdf)
-* [Portenta Max Carrier pinout](https://docs.arduino.cc/static/d0bd73b17e97af0fe376b7d518b18660/ABX00043-full-pinout.pdf)
+* [Portenta X8 pinout](/resources/pinouts/ABX00049-full-pinout.pdf)
+* [Portenta Breakout pinout](/resources/pinouts/ASX00031-full-pinout.pdf)
+* [Portenta Max Carrier pinout](/resources/pinouts/ABX00043-full-pinout.pdf)
 * [Portenta Hat Carrier pinout](https://docs.arduino.cc/resources/pinouts/ASX00049-full-pinout.pdf)
 
 ## Communication

content/hardware/04.pro/carriers/portenta-max-carrier/tutorials/user-manual/content.md

@@ -381,7 +381,7 @@ If the connection is successful, you should see your IP address and location inf
 
 The Portenta X8, H7, and C33 enhance functionality through High-Density connectors. For a comprehensive understanding of these connectors, please refer to the complete pinout documentation for each Portenta model.
 
-- [Complete Portenta X8 pinout information](https://docs.arduino.cc/static/019dd9ac3b08f48192dcb1291d37aab9/ABX00049-full-pinout.pdf)
+- [Complete Portenta X8 pinout information](/resources/pinouts/ABX00049-full-pinout.pdf)
 - [Complete Portenta H7 pinout information](https://docs.arduino.cc/resources/pinouts/ABX00042-full-pinout.pdf)
 - [Complete Portenta C33 pinout information](https://docs.arduino.cc/resources/pinouts/ABX00074-full-pinout.pdf)
 

content/hardware/04.pro/carriers/portenta-mid-carrier/tutorials/user-manual/content.md

@@ -569,7 +569,7 @@ The Portenta X8, H7, and C33 models expand their capabilities using High-Density
 
 This documentation provides an in-depth view of the connectors, ensuring a comprehensive understanding of how they enhance the functionality of these devices.
 
-- [Complete Portenta X8 pinout information](https://docs.arduino.cc/static/019dd9ac3b08f48192dcb1291d37aab9/ABX00049-full-pinout.pdf)
+- [Complete Portenta X8 pinout information](/resources/pinouts/ABX00049-full-pinout.pdf)
 - [Complete Portenta H7 pinout information](https://docs.arduino.cc/resources/pinouts/ABX00042-full-pinout.pdf)
 - [Complete Portenta C33 pinout information](https://docs.arduino.cc/resources/pinouts/ABX00074-full-pinout.pdf)