Support customizing font for i3-wm.bar.fonts in Regolith 2

[lapwingcloud]

• [x] I've run a search on the existing enhancements to make sure I'm not filing a duplicate (you can use the search box at the top left corner)
• [x] I've read the Regolith documentation and didn't find any relevant topic
• [ ] I tried asking on Slack (especially for configuration related issues)

Is your feature request related to a problem? Please describe.

In https://github.com/regolith-linux/regolith-i3-config/blob/856253cc45893b10eb694ac29e2bd6696e8f9209/partials/70_bar#L11

it sets i3 bar font to be gtk.monospace_font_name , which means the bar font is always the same as system font, but what I want is using different font for i3 bar, e.g.

gtk.monospace_font_name: JetBrains Mono 12
i3-wm.bar.font: JetBrains Mono 9

Describe the solution you'd like

see above

Describe alternatives you've considered none

Additional context none

[kgilmer]

Yeah good idea, thanks @jchenau