docs: link to sourcepp official site

Author: craftablescience

README.md

@@ -93,7 +93,7 @@ Any contributors will be added to the credits in the form of a text file shipped
 
 ## Backend
 
-This tool is powered by a collection of open-source C++20 Source engine parsers called [sourcepp](https://github.com/craftablescience/sourcepp).
+This tool is powered by a collection of open-source C++20 Source engine parsers called [sourcepp](https://sourcepp.org).
 
 ## Star History