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/container-flow.js

@@ -0,0 +1,84 @@
+/**
+ * @import {State} from 'mdast-util-to-markdown'
+ * @import {FlowChildren, FlowParents, TrackFields} from '../types.js'
+ */
+
+/**
+ * @param {FlowParents} parent
+ *   Parent of flow nodes.
+ * @param {State} state
+ *   Info passed around about the current state.
+ * @param {TrackFields} info
+ *   Info on where we are in the document we are generating.
+ * @returns {string}
+ *   Serialized children, joined by (blank) lines.
+ */
+export function containerFlow(parent, state, info) {
+  const indexStack = state.indexStack
+  const children = parent.children || []
+  const tracker = state.createTracker(info)
+  /** @type {Array<string>} */
+  const results = []
+  let index = -1
+
+  indexStack.push(-1)
+
+  while (++index < children.length) {
+    const child = children[index]
+
+    indexStack[indexStack.length - 1] = index
+
+    results.push(
+      tracker.move(
+        state.handle(child, parent, state, {
+          before: '\n',
+          after: '\n',
+          ...tracker.current()
+        })
+      )
+    )
+
+    if (child.type !== 'list') {
+      state.bulletLastUsed = undefined
+    }
+
+    if (index < children.length - 1) {
+      results.push(
+        tracker.move(between(child, children[index + 1], parent, state))
+      )
+    }
+  }
+
+  indexStack.pop()
+
+  return results.join('')
+}
+
+/**
+ * @param {FlowChildren} left
+ * @param {FlowChildren} right
+ * @param {FlowParents} parent
+ * @param {State} state
+ * @returns {string}
+ */
+function between(left, right, parent, state) {
+  let index = state.join.length
+
+  while (index--) {
+    const result = state.join[index](left, right, parent, state)
+
+    if (result === true || result === 1) {
+      break
+    }
+
+    if (typeof result === 'number') {
+      return '\n'.repeat(1 + result)
+    }
+
+    if (result === false) {
+      return '\n\n<!---->\n\n'
+    }
+  }
+
+  return '\n\n'
+}