docs(docs): add strategy, coding, and system design documentation hierarchy

docs/content/02-guides/03-behavioral/index.mdx

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+---
+title: 'Coding'
+sidebar:
+  label: Overview
+  icon: arrow-right-circle
+  order: 1
+---
+
+## Description
+
+Given two integer arrays `nums1` and `nums2`, return the minimum number of operations required to make both arrays equal.
+
+You have the following three choices to modify two arrays:

docs/content/02-guides/03-behavioral/meta.ts

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+import { defineMeta } from "blume";
+
+export default defineMeta({
+  title: "Behavioral",
+  order: 3,
+  collapsed: true,
+  icon: "handshake",
+  display: "page",
+});