chore: Add stylelint rules to verify we only use logical properties

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

build/files-checker.php

@@ -76,6 +76,7 @@
 	'resources',
 	'robots.txt',
 	'status.php',
+	'stylelint.config.js',
 	'tests',
 	'themes',
 	'tsconfig.json',