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/handle/paragraph.js

@@ -0,0 +1,20 @@
+/**
+ * @import {Info, State} from 'mdast-util-to-markdown'
+ * @import {Paragraph, Parents} from 'mdast'
+ */
+
+/**
+ * @param {Paragraph} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function paragraph(node, _, state, info) {
+  const exit = state.enter('paragraph')
+  const subexit = state.enter('phrasing')
+  const value = state.containerPhrasing(node, info)
+  subexit()
+  exit()
+  return value
+}