[Website] Add `weight`, `width`, and `italic` filters to the home page

Imagine you're looking for a **"condensed sans-serif font with weight 700"** for headings. You go to the Google Fonts website and try to select filters, but all you can do is select the `Sans Serif` category. That's it. So, this isn't really an efficient way to quickly find exactly what you want.

There should be better filters. Filters that are actually connected to font styles rather than just tags. Width, weight, and italic - these filters should actually be more than enough.