Fix Safari CSS loading issue with base tag

Safari was not loading CSS correctly through the Netlify proxy due
to relative path resolution. Adding <base href="/thedaily/"> ensures
all relative URLs resolve correctly regardless of browser.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dshkol

observablehq.config.js

@@ -7,6 +7,9 @@ export default {
   // Base path for subdirectory deployment (dshkol.com/thedaily)
   base: "/thedaily",
 
+  // Add base tag for Safari compatibility with proxied deployment
+  head: `<base href="/thedaily/">`,
+
   root: "docs",
   output: "dist",
   style: "style.css",