docs: Include all font styles and weight combinations as needed

Author: Danielku15

src/css/custom.scss

@@ -4,15 +4,26 @@
  * work well for content-centric websites.
  */
 
-@import "@fontsource/noto-sans";
 @import "@fontsource/noto-sans/300.css";
+@import "@fontsource/noto-sans/400.css";
 @import "@fontsource/noto-sans/500.css";
 @import "@fontsource/noto-sans/700.css";
-@import "@fontsource/noto-serif";
+
+@import "@fontsource/noto-sans/300-italic.css";
+@import "@fontsource/noto-sans/400-italic.css";
+@import "@fontsource/noto-sans/500-italic.css";
+@import "@fontsource/noto-sans/700-italic.css";
+
 @import "@fontsource/noto-serif/300.css";
+@import "@fontsource/noto-serif/400.css";
 @import "@fontsource/noto-serif/500.css";
 @import "@fontsource/noto-serif/700.css";
 
+@import "@fontsource/noto-serif/300-italic.css";
+@import "@fontsource/noto-serif/400-italic.css";
+@import "@fontsource/noto-serif/500-italic.css";
+@import "@fontsource/noto-serif/700-italic.css";
+
 /* You can override the default Infima variables here. */
 :root {
   --ifm-color-primary: #426d9d;