Not work on Windows

[sunfkny]

Hi, this commit breaks Windows support: 5ba8618

On Windows, the path separator \ causes two issues:

• indexHTML does not work
• Routes do not match because generated paths contain \

This issue also breaks https://github.com/SaltyAom/elysia-fullstack-example on Windows

[touhidurrr]

more specifically I would say that nothing works on windows. they broke this plugin again completely. @SaltyAom

[touhidurrr]

Also #51