docs(docs): add page icon frontmatter to problem pages

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Prad Nukala committed 2026-09-25 13:14:25 -04:00
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---
title: '226. Invert Binary Tree'
description: Given the root of a binary tree, invert the tree, and return its root
icon: line-dot-left-horizontal
sidebar:
label: 'Invert Binary Tree'
badge: 'Easy'