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/mdast-util-to-markdown/lib/util/compile-pattern.js

@@ -0,0 +1,24 @@
+/**
+ * @import {CompilePattern} from '../types.js'
+ */
+
+/**
+ * @type {CompilePattern}
+ */
+export function compilePattern(pattern) {
+  if (!pattern._compiled) {
+    const before =
+      (pattern.atBreak ? '[\\r\\n][\\t ]*' : '') +
+      (pattern.before ? '(?:' + pattern.before + ')' : '')
+
+    pattern._compiled = new RegExp(
+      (before ? '(' + before + ')' : '') +
+        (/[|\\{}()[\]^$+*?.-]/.test(pattern.character) ? '\\' : '') +
+        pattern.character +
+        (pattern.after ? '(?:' + pattern.after + ')' : ''),
+      'g'
+    )
+  }
+
+  return pattern._compiled
+}