Use new code font generally to fix Android monospace

Using a specific font, and hosting it ourselves, allows us to ensure consistent behavior and a code font that covers the Nushell table border drawings characters.

Adds FiraCode font, which is under OFL (SIL Open Font license).

https://github.com/tonsky/FiraCode

Introduces a 100 kb font file download, which should happen only once through adequate cashing.

Author: Kissaki

.vuepress/config.js

@@ -90,6 +90,7 @@ export default defineUserConfig({
     },
   },
   head: [
+    ["link", { rel: "preload", href: "/fonts/FiraCode-Regular.woff2", as: "font", type: "font/woff2", crossorigin: "anonymous" }]
     ['meta', { name: 'theme-color', content: '#3eaf7c' }],
     ['meta', { name: 'apple-mobile-web-app-capable', content: 'yes' }],
     [

.vuepress/public/fonts/FiraCode-Regular.woff

@@ -1,3 +1,10 @@
+@font-face {
+  font-family: 'Fira Code';
+  src: url('/fonts/FiraCode-Regular.woff2') format('woff2'), url("woff/FiraCode-Regular.woff") format("woff");
+  font-weight: 400;
+  font-style: normal;
+}
+
 .navbar .navbar-items-wrapper {
   flex-direction: row-reverse;
 }
@@ -29,7 +36,7 @@ div[class*='language-'].line-numbers-mode .line-numbers {
  */
 :root {
   --code-line-height: 1.1;
-  --font-family-code: Consolas, Monaco, 'Andale Mono', 'DejaVu Sans Mono',
+  --font-family-code: 'Fira Code', Consolas, Monaco, 'Andale Mono', 'DejaVu Sans Mono',
     'Ubuntu Mono', monospace;
 }