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/format-link-as-autolink.js

@@ -0,0 +1,34 @@
+/**
+ * @import {State} from 'mdast-util-to-markdown'
+ * @import {Link} from 'mdast'
+ */
+
+import {toString} from 'mdast-util-to-string'
+
+/**
+ * @param {Link} node
+ * @param {State} state
+ * @returns {boolean}
+ */
+export function formatLinkAsAutolink(node, state) {
+  const raw = toString(node)
+
+  return Boolean(
+    !state.options.resourceLink &&
+      // If there’s a url…
+      node.url &&
+      // And there’s a no title…
+      !node.title &&
+      // And the content of `node` is a single text node…
+      node.children &&
+      node.children.length === 1 &&
+      node.children[0].type === 'text' &&
+      // And if the url is the same as the content…
+      (raw === node.url || 'mailto:' + raw === node.url) &&
+      // And that starts w/ a protocol…
+      /^[a-z][a-z+.-]+:/i.test(node.url) &&
+      // And that doesn’t contain ASCII control codes (character escapes and
+      // references don’t work), space, or angle brackets…
+      !/[\0- <>\u007F]/.test(node.url)
+  )
+}