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-code-as-indented.js

@@ -0,0 +1,22 @@
+/**
+ * @import {State} from 'mdast-util-to-markdown'
+ * @import {Code} from 'mdast'
+ */
+
+/**
+ * @param {Code} node
+ * @param {State} state
+ * @returns {boolean}
+ */
+export function formatCodeAsIndented(node, state) {
+  return Boolean(
+    state.options.fences === false &&
+      node.value &&
+      // If there’s no info…
+      !node.lang &&
+      // And there’s a non-whitespace character…
+      /[^ \r\n]/.test(node.value) &&
+      // And the value doesn’t start or end in a blank…
+      !/^[\t ]*(?:[\r\n]|$)|(?:^|[\r\n])[\t ]*$/.test(node.value)
+  )
+}