Add Roboto font as dependency instead of using Google-hosted fonts

[romankaravia]

This is a proposal to install the Roboto font as a dependency of create-vuetify instead of using Google-hosted fonts.

Current situation

• create-vuetify uses unplugin-fonts to load the Roboto font directly from Google servers (see unplugin-fonts config), which may violate GDPR or at least require user consent
• There is a dependency on roboto-fontface in package.json, but it is unused, as far as I can tell
• The font config is missing italic style (see #40)

Proposed improvement

A way to fix all of the above issues could be to use unplugin-fonts (existing dependency), add @fontsource/roboto, remove roboto-fontface, and adapt the unplugin-fonts config to use the locally installed Roboto font and also add italic style. See also detailed description in this issue comment.

I'd be happy to have a go at implementing this, but would first like to get some feedback about whether such a change would be welcomed by the maintainer(s) or not.