chore: clean up content phase organization

apps/docs/content/(05-decision-space)/1d-dynamic-programming/70-climbing-stairs.mdx

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+---
+title: '70. Climbing Stairs'
+description: You are climbing a staircase. It takes n steps to reach the top
+icon: dot
+sidebar:
+  label: 'Climbing Stairs'
+  badge: 'Easy'
+---
+
+<Badge variant="accent">Math</Badge>
+
+### Example 1:
+- Input: `n = 2`
+- Output: `2`
+- Explanation: There are two ways to climb to the top. `1`. `1` step + `1` step `2`. `2` steps
+
+### Example 2:
+- Input: `n = 3`
+- Output: `3`
+- Explanation: There are three ways to climb to the top. `1`. `1` step + `1` step + `1` step `2`. `1` step + `2` steps `3`. `2` steps + `1` step
+
+### Constraints:
+
+- `1 <= n <= 45`
+
+## Solution
+
+```py
+class Solution:
+    def climbStairs(self, n: int) -> int:
+        if n == 1:
+            return 1
+        if n == 2:
+            return 2
+
+        first, second = 1, 2
+
+        for _ in range(3, n + 1):
+            third = first + second
+            first, second = second, third
+
+        return second
+```

apps/docs/content/(05-decision-space)/1d-dynamic-programming/meta.ts

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+import { defineMeta } from "blume";
+
+export default defineMeta({ title: "1-D Dynamic Programming", order: 21, icon: "columns-3", display: "group" });