docs(docs): restructure guides into numbered groups and add meta files

apps/docs/content/guides/(3-techniques)/combinatorics.mdx

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+---
+title: "Combinatorics"
+list: "https://leetcode.com/problem-list/combinatorics/"
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Combinatorics.
+:::

apps/docs/content/guides/(3-techniques)/counting.mdx

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+---
+title: "Counting"
+list: "https://leetcode.com/problem-list/counting/"
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Counting.
+:::

apps/docs/content/guides/(3-techniques)/design.mdx

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+---
+title: "Design"
+list: "https://leetcode.com/problem-list/design/"
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Design.
+:::

apps/docs/content/guides/(3-techniques)/geometry.mdx

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+---
+title: "Geometry"
+list: "https://leetcode.com/problem-list/geometry/"
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Geometry.
+:::

apps/docs/content/guides/(3-techniques)/math.mdx

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+---
+title: "Math"
+list: "https://leetcode.com/problem-list/math/"
+---
+
+:::note
+This guide has not been written yet. The LeetCode list above has every problem tagged Math.
+:::

apps/docs/content/guides/(3-techniques)/meta.ts

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+import { defineMeta } from "blume";
+
+export default defineMeta({ title: "Techniques", order: 3 });