Update CustomStyles.astro to optimize font loading by adding font-face properties and removing unused imports

src/components/CustomStyles.astro

@@ -1,6 +1,4 @@
 ---
-import '@fontsource-variable/inter';
-
 // 'DM Sans'
 // Nunito
 // Dosis
@@ -23,7 +21,10 @@ import '@fontsource-variable/inter';
   /* Optimize font loading with font-display:swap */
   @font-face {
     font-family: 'Inter Variable';
+    font-style: normal;
+    font-weight: 100 900;
     font-display: swap;
+    src: url('/fonts/inter-variable.woff2') format('woff2');
   }
 
   :root {