Add mkdocs for docs

docs/programmers/api-variables/variable-error-reporting.md

@@ -2,7 +2,7 @@
 ==================
 
 When this value is set to a non-null-value it\'s value is used as php\'s
-[`error_reporting`](&url.php-manual;error_reporting) level inside of
+[`error_reporting`](https://www.php.net/error_reporting) level inside of
 [`display()`](#api.display) and [`fetch()`](#api.fetch).
 
 Smarty 3.1.2 introduced the

docs/programmers/api-variables/variable-use-sub-dirs.md

@@ -19,7 +19,7 @@ almost nothing.
 > **Note**
 >
 > -   `$use_sub_dirs=true` doesn\'t work with
->     [safe\_mode=On](&url.php-manual;features.safe-mode), that\'s why
+>     [safe\_mode=On](https://www.php.net/features.safe-mode), that\'s why
 >     it\'s switchable and why it\'s off by default.
 >
 > -   `$use_sub_dirs=true` on Windows can cause problems.