fix: Update theme generator link

Author: ltoenning

docs/home/themes.md

@@ -9,7 +9,7 @@ Mr fsenthusiast has not only created a couple of **different themes** for *swift
 
 ## Download & Generate Themes
 
-Download a ready to use theme or create a custom style sheet: **[fsenthusiast swift Style Sheet Generator](http://fsenthusiast.net/swift/themes.php)**
+Download a ready to use theme or create a custom style sheet: **[fsenthusiast swift Style Sheet Generator](https://fsenthusiast.com/swift/index.php)**
 
 
 ![](./../img/themes_01.jpg){: style="width:32%"}