fix: move fonts and refactor headers in middleware

app/fonts.ts

@@ -0,0 +1,25 @@
+import { Fira_Mono, Fira_Sans } from "next/font/google"
+import localFont from "next/font/local"
+
+export const firaMono = Fira_Mono({
+  subsets: ["latin"],
+  weight: ["400", "500", "700"],
+  variable: "--ff-fira-mono",
+})
+
+export const firaSans = Fira_Sans({
+  subsets: ["latin"],
+  weight: ["300", "400", "600", "900"],
+  variable: "--ff-fira-sans",
+})
+
+export const biroScriptPlus = localFont({
+  src: [
+    {
+      path: "../public/_static/fonts/biro-script-plus/Biro-Script-Plus.ttf",
+      style: "normal",
+      weight: "500",
+    },
+  ],
+  variable: "--ff-biro-script-plus",
+})