Integrate Comparison Table into PyFixest vs Fixest vs Stata Vignette

Can we integrate @Wenzhi-Ding 's syntax table [here](https://github.com/py-econometrics/pyfixest/issues/335#issuecomment-1980292148) into the notebooks on [PyFixest vs fixest](https://py-econometrics.github.io/pyfixest/compare-fixest-pyfixest.html) and [PyFixest vs Stata](https://py-econometrics.github.io/pyfixest/stata-2-pyfixest.html)? 