Replace Nerd Fonts

We now use the Ubuntu and CascadiaCode fonts from the official sources.
These are smaller in size and are much better for web usage.

_includes/styles/fonts.scss

@@ -1,24 +1,24 @@
 @font-face {
-  font-family: "Ubuntu Nerd Font";
+  font-family: "Ubuntu";
   font-weight: normal;
-  src: url("/fonts/UbuntuNerdFont-Regular.ttf") format("truetype");
+  src: url("/fonts/Ubuntu-Regular.ttf") format("truetype");
 }
 
 @font-face {
-  font-family: "Ubuntu Nerd Font";
+  font-family: "Ubuntu";
   font-style: italic;
   font-weight: normal;
-  src: url("/fonts/UbuntuNerdFont-Italic.ttf") format("truetype");
+  src: url("/fonts/Ubuntu-RegularItalic.ttf") format("truetype");
 }
 
 @font-face {
-  font-family: "Ubuntu Nerd Font";
+  font-family: "Ubuntu";
   font-weight: bold;
-  src: url("/fonts/UbuntuNerdFont-Bold.ttf") format("truetype");
+  src: url("/fonts/Ubuntu-Bold.ttf") format("truetype");
 }
 
 @font-face {
-  font-family: "CaskaydiaCove Nerd Font Mono";
+  font-family: "CascadiaCode";
   font-weight: normal;
-  src: url("/fonts/CaskaydiaCoveNerdFontMono-Regular.ttf") format("truetype");
+  src: url("/fonts/CascadiaMono-Regular.woff2") format("woff2");
 }

_includes/styles/variables.scss

@@ -25,6 +25,6 @@ :root {
   --page--max-width: 48rem;
 
   /* Fonts */
-  --font--sans-serif: Ubuntu Nerd Font, Ubuntu, Inter, -apple-system, BlinkMacSystemFont, sans-serif;
-  --font--mono: CaskaydiaCove Nerd Font Mono, monospace;
+  --font--sans-serif: Ubuntu, Inter, -apple-system, BlinkMacSystemFont, sans-serif;
+  --font--mono: CascadiaCode, monospace;
 }