Fix issue on mobile where some documentation pages become wider than the screen

[cabralpinto]

The pages in question are:

• https://cabralpinto.github.io/modular-diffusion/guides/custom-modules/
• https://cabralpinto.github.io/modular-diffusion/modules/noise-type/
• https://cabralpinto.github.io/modular-diffusion/modules/loss-function/

The issue is caused by LaTeX expressions that don't fit smaller screens. I'm not quite sure how this could be fixed.