refacto: Remake the interface so it is more 'vintage' looking + Adding a full calendar page

server.js

@@ -17,9 +17,15 @@ const MIME_TYPES = {
   '.json': 'application/json; charset=utf-8',
   '.svg': 'image/svg+xml',
   '.png': 'image/png',
+  '.jpg': 'image/jpeg',
+  '.woff2': 'font/woff2',
+  '.txt': 'text/plain; charset=utf-8',
   '.ico': 'image/x-icon',
 };
 
+// Binary assets never change without a rename, so they can be cached for a day.
+const CACHEABLE_EXTENSIONS = new Set(['.jpg', '.woff2', '.svg']);
+
 function sendJson(res, statusCode, payload) {
   const body = JSON.stringify(payload);
   res.writeHead(statusCode, {
@@ -78,7 +84,11 @@ function serveStatic(res, rootDir, requestPath) {
       return;
     }
     const ext = path.extname(filePath).toLowerCase();
-    res.writeHead(200, { 'Content-Type': MIME_TYPES[ext] || 'application/octet-stream' });
+    const headers = { 'Content-Type': MIME_TYPES[ext] || 'application/octet-stream' };
+    if (CACHEABLE_EXTENSIONS.has(ext)) {
+      headers['Cache-Control'] = 'public, max-age=86400';
+    }
+    res.writeHead(200, headers);
     res.end(content);
   });
 }