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/micromark-core-commonmark/lib/label-start-link.js

@@ -0,0 +1,55 @@
+/**
+ * @import {
+ *   Construct,
+ *   State,
+ *   TokenizeContext,
+ *   Tokenizer
+ * } from 'micromark-util-types'
+ */
+
+import { labelEnd } from './label-end.js';
+
+/** @type {Construct} */
+export const labelStartLink = {
+  name: 'labelStartLink',
+  resolveAll: labelEnd.resolveAll,
+  tokenize: tokenizeLabelStartLink
+};
+
+/**
+ * @this {TokenizeContext}
+ *   Context.
+ * @type {Tokenizer}
+ */
+function tokenizeLabelStartLink(effects, ok, nok) {
+  const self = this;
+  return start;
+
+  /**
+   * Start of label (link) start.
+   *
+   * ```markdown
+   * > | a [b] c
+   *       ^
+   * ```
+   *
+   * @type {State}
+   */
+  function start(code) {
+    effects.enter("labelLink");
+    effects.enter("labelMarker");
+    effects.consume(code);
+    effects.exit("labelMarker");
+    effects.exit("labelLink");
+    return after;
+  }
+
+  /** @type {State} */
+  function after(code) {
+    // To do: this isn’t needed in `micromark-extension-gfm-footnote`,
+    // remove.
+    // Hidden footnotes hook.
+    /* c8 ignore next 3 */
+    return code === 94 && '_hiddenFootnoteSupport' in self.parser.constructs ? nok(code) : ok(code);
+  }
+}