Fix CV font: use dedicated CVBase layout instead of main site layout

The main site Base layout sets a dark monospace font that overrides
the CV's Poppins font. CV pages now use CVBase which has no global
font overrides.

src/layouts/CVBase.astro

@@ -0,0 +1,17 @@
+---
+const { title } = Astro.props;
+---
+
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>{title}</title>
+    <link rel="icon" href="/src/img/favicon.ico" type="image/x-icon" />
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/boxicons@latest/css/boxicons.min.css" />
+  </head>
+  <body>
+    <slot />
+  </body>
+</html>