Add Adwaita Sans to the Neo-Grotesque font stack

[renanglr]

https://gitlab.gnome.org/GNOME/adwaita-fonts

Adwaita Sans is a rebranded Inter with the cv05 (Lower-case L with tail) variant enabled. It will become the default font for GNOME in version 48 due in March (source), but since this change closer to the toolkit level, virtually every Linux desktop will have it installed by the end of the year.

It might be interesting to add this font to the stack or to replace Inter with it, although I don't know what are your thoughts on the lower-case tailed L.