feat: initialize markr nostr bookmark client

- Add project structure with TypeScript, React, and Vite
- Implement nostr authentication using browser extension (NIP-07)
- Add NIP-51 compliant bookmark fetching and display
- Create minimal UI with login and bookmark components
- Integrate applesauce-core and applesauce-react libraries
- Add responsive styling with dark/light mode support
- Include comprehensive README with setup instructions

This is a minimal MVP for a nostr bookmark client that allows users to
view their bookmarks according to NIP-51 specification.

node_modules/flat-cache/src/del.js

@@ -0,0 +1,13 @@
+var rimraf = require('rimraf').sync;
+var fs = require('fs');
+
+module.exports = function del(file) {
+  if (fs.existsSync(file)) {
+    //if rimraf doesn't throw then the file has been deleted or didn't exist
+    rimraf(file, {
+      glob: false,
+    });
+    return true;
+  }
+  return false;
+};