fonts-import-fix (#9705)

* style: replace hardcoded font-family with CSS variables for consistency

* feat(ui): centralize font assets and update build configs for fonts

* fix(ui): remove fonts packaging and update style imports to main.css

Author: PavelLaptev

apps/desktop/src/routes/+layout.svelte

@@ -1,5 +1,4 @@
 <script lang="ts">
-	import '@gitbutler/ui/main.css';
 	import '../styles/styles.css';
 
 	import { browser, dev } from '$app/environment';