Support Font Weight Variation

[SilentGlasses]

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• [X] Completed

Describe the feature

When setting font, it would be nice to be able to set the weight variation as well..

If applicable, add mockups / screenshots to help present your vision of the feature

I don't have a screenshot but, as it is right now we can only call the font:

"buffer_font_family": "VictorMono Nerd Font",

but it would be nice to be able to set the following:

"buffer_font_family": "VictorMono Nerd Font Light",