Force utf8 mode on Windows (#3925)

* Force utf8 mode on Windows

* Fix timeout

* Syntax fixes

Author: tunetheweb

src/tools/scripts/run_and_test_website.bat

@@ -26,7 +26,8 @@ echo "Building website"
 call npm run generate
 
 echo "Starting website"
-start python main.py
+rem # Can remove -Xutf8 argument after Python 3.15 is everywhere - https://peps.python.org/pep-0686/
+start python -Xutf8 main.py
 rem # Sleep for 5 seconds to make sure server is up
 timeout /t 5 /nobreak
 rem # Use sleep as well in case running in GitBash where above command fails