docs(content): add issue URLs to problem pages and restructure guides into appendix

apps/docs/content/appendix/(1-data-structures)/array.mdx

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+---
+title: "Array"
+list: "https://leetcode.com/problem-list/array/"
+icon: list-ordered
+sidebar:
+  badge: '41'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Array.
+:::

apps/docs/content/appendix/(1-data-structures)/binary-tree.mdx

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+---
+title: "Binary Tree"
+list: "https://leetcode.com/problem-list/binary-tree/"
+icon: git-branch
+sidebar:
+  badge: '9'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Binary Tree.
+:::

apps/docs/content/appendix/(1-data-structures)/directed-acyclic-graph.mdx

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+---
+title: "Directed Acyclic Graph"
+list: "https://leetcode.com/problem-list/directed-acyclic-graph/"
+icon: route
+sidebar:
+  badge: '1'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Directed Acyclic Graph.
+:::

apps/docs/content/appendix/(1-data-structures)/doubly-linked-list.mdx

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+---
+title: "Doubly-Linked List"
+list: "https://leetcode.com/problem-list/doubly-linked-list/"
+icon: link-2
+sidebar:
+  badge: '1'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Doubly-Linked List.
+:::

apps/docs/content/appendix/(1-data-structures)/graph.mdx

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+---
+title: "Graph Theory"
+list: "https://leetcode.com/problem-list/graph/"
+icon: share-2
+sidebar:
+  badge: '5'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Graph Theory.
+:::

apps/docs/content/appendix/(1-data-structures)/k-d-tree.mdx

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+---
+title: "K-D Tree"
+list: "https://leetcode.com/problem-list/k-d-tree/"
+icon: axis-3d
+sidebar:
+  badge: '1'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged K-D Tree.
+:::

apps/docs/content/appendix/(1-data-structures)/meta.ts

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+import { defineMeta } from "blume";
+
+export default defineMeta({ title: "Data Structures", order: 1 });

apps/docs/content/appendix/(1-data-structures)/queue.mdx

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+---
+title: "Queue"
+list: "https://leetcode.com/problem-list/queue/"
+icon: list-end
+sidebar:
+  badge: '1'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Queue.
+:::

apps/docs/content/appendix/(1-data-structures)/string.mdx

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+---
+title: "String"
+list: "https://leetcode.com/problem-list/string/"
+icon: quote
+sidebar:
+  badge: '16'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged String.
+:::

apps/docs/content/appendix/(1-data-structures)/tree.mdx

@@ -0,0 +1,11 @@
+---
+title: "Tree"
+list: "https://leetcode.com/problem-list/tree/"
+icon: tree-deciduous
+sidebar:
+  badge: '9'
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Tree.
+:::