feat: update system font

uses the snippet from vscode (along with geist and inter in front)

Author: intergrav

dev.css

@@ -26,8 +26,9 @@
 /* 1. default configuration */
 :root {
 	/* font families */
-	--dc-font-sans: "Geist", "Inter", -apple-system, BlinkMacSystemFont,
-		"Segoe UI", sans-serif;
+	--dc-font-sans: "Geist", "Inter", system-ui, -apple-system, BlinkMacSystemFont,
+		"Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue",
+		sans-serif;
 	--dc-font-mono: "Geist Mono", monospace;
 
 	/* light colors */