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/decode-named-character-reference/index.js

@@ -0,0 +1,19 @@
+import {characterEntities} from 'character-entities'
+
+// To do: next major: use `Object.hasOwn`.
+const own = {}.hasOwnProperty
+
+/**
+ * Decode a single character reference (without the `&` or `;`).
+ * You probably only need this when you’re building parsers yourself that follow
+ * different rules compared to HTML.
+ * This is optimized to be tiny in browsers.
+ *
+ * @param {string} value
+ *   `notin` (named), `#123` (deci), `#x123` (hexa).
+ * @returns {string|false}
+ *   Decoded reference.
+ */
+export function decodeNamedCharacterReference(value) {
+  return own.call(characterEntities, value) ? characterEntities[value] : false
+}