Fix GitHub Pages stylesheet URL by pinning main.scss permalink

Author: rokoss21

docs/assets/main.css docs/assets/main.scssdocs/assets/main.css renamed to docs/assets/main.scss

@@ -1,3 +1,7 @@
+---
+permalink: /assets/main.css
+---
+
 :root {
   --bg: #f3f6f8;
   --surface: #ffffff;