Support for React Router v8

### To Reproduce ``` mkdir fumadocs-react-router8 cd fumadocs-react-router8 npm init -y npm i fumadocs-core react-router@8 ``` ### Current vs. Expected behavior `fumadocs-core` is not compatible with the newly released `react-router@8` ### Framework React Router ### Provide environment information ```bash Framework: React Router v8 ``` ### Which area(s) are affected? (Select all that apply) Core ### Additional context _No response_