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-string/lib/index.d.ts

@@ -0,0 +1,31 @@
+/**
+ * Get the text content of a node or list of nodes.
+ *
+ * Prefers the node’s plain-text fields, otherwise serializes its children,
+ * and if the given value is an array, serialize the nodes in it.
+ *
+ * @param {unknown} [value]
+ *   Thing to serialize, typically `Node`.
+ * @param {Options | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns {string}
+ *   Serialized `value`.
+ */
+export function toString(
+  value?: unknown,
+  options?: Options | null | undefined
+): string
+export type Nodes = import('mdast').Nodes
+/**
+ * Configuration (optional).
+ */
+export type Options = {
+  /**
+   * Whether to use `alt` for `image`s (default: `true`).
+   */
+  includeImageAlt?: boolean | null | undefined
+  /**
+   * Whether to use `value` of HTML (default: `true`).
+   */
+  includeHtml?: boolean | null | undefined
+}