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/indent-lines.js

@@ -0,0 +1,35 @@
+/**
+ * @import {IndentLines} from '../types.js'
+ */
+
+const eol = /\r?\n|\r/g
+
+/**
+ * @type {IndentLines}
+ */
+export function indentLines(value, map) {
+  /** @type {Array<string>} */
+  const result = []
+  let start = 0
+  let line = 0
+  /** @type {RegExpExecArray | null} */
+  let match
+
+  while ((match = eol.exec(value))) {
+    one(value.slice(start, match.index))
+    result.push(match[0])
+    start = match.index + match[0].length
+    line++
+  }
+
+  one(value.slice(start))
+
+  return result.join('')
+
+  /**
+   * @param {string} value
+   */
+  function one(value) {
+    result.push(map(value, line, !value))
+  }
+}