[DOCS] - Generate board documentation automaticaly from platformio.ini (#1405)

* [DOCS] - Generate board documentation automaticaly from platformio.ini

To reduce maintenance effort

* [CI] Differentiate boards from platformio.ini

So that only one line can be commented to use customs environments

docs/prerequisites/boards/.gitignore

@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore