Removed React Compiler from the project configuration and dependencies.
### What changed?
- Removed `reactCompiler: true` from the experimental options in `next.config.ts`
- Removed `babel-plugin-react-compiler` dependency from `package.json`
- Updated formatting in `next.config.ts` to use consistent indentation and semicolons
### Why make this change?
React Compiler (formerly React Forget) is still in experimental phase and may be causing stability issues or unnecessary complexity in the build process. Removing it simplifies our dependency tree while maintaining full functionality. The PostHog update ensures we're using the latest version with any bug fixes or improvements.
